Not able to find the elements under nobr tag - selenium

Question

Not able to find the element with input tag. Need to find the element in the input tag. eclipse could catch the element till nobr and not further.
input id="ServiceFromDate" class="inactvDtTmTxt" name="$PHCClaimSearch$pServiceFromDate" data-ctl="["DatePicker"]" data-formatting="yes" value="05/02/2017" data-value="5/2/2017" style="padding-right:17px;width:11.719em;" validationtype="date" data-change="[["refresh", ["thisSection","", "", "&=", "", ",",":event","","HCClaimSearch"]]]" data-display-value="05/02/2017" type="text"/>
//table[contains(#role,'presentation')][contains(#id,'pyActionArea')]//table[1]//table[contains(#role,'presentation')][contains(#section_index,'1')]//tbody//tr[2]//td[1]//following::nobr[1]//following::span[#id='$PHCClaimSearch$pServiceFromDateSpan']/input
driver.findElement(By.xpath("//input[#id='ServiceFromDate']")).sendKeys("04242015")
<table id="" role="presentation" section_index="1" cellspacing="0" cellpadding="0">
<tbody>
<tr>
<tr>
<td class="dataLabelWrite" style="height:24px;width:143px;">
<td class="dataValueWrite" style="height:24px;width:190px;">
<nobr>
<ins id="pega-calendar" style="display: none;" data-calendar="{"img":"webwb/pzspacercal_12860256145.gif!!.gif","locale":[["0","1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29","30","31","32","33","34","35","36","37","38","39","40","41","42","43","44","45","46","47","48","49","50","51","52","53","54","55","56","57","58","59"],0,"M/d/yyyy","M/d/yyyy h:mm a","Today",["January","February","March","April","May","June","July","August","September","October","November","December"],["Sun","Mon","Tue","Wed","Thu","Fri","Sat"],["AM","PM"],"Apply","Close"]}"/>
<script> var positionDatePickerIcn = function(control){ /* BUG-47098 - Following block filters out IE8(both quirks and standards modes) and IE9 (standards mode) */ var addMarginFlag = true; if(document.documentMode && navigator.userAgent.indexOf("Trident/4") > -1){ //IE8: skip for both standards and quirks mode addMarginFlag = false; } else if(document.documentMode && document.documentMode >= 9 && navigator.userAgent.indexOf("Trident/5") > -1){ //IE9: skip for standards mode addMarginFlag = false; } if (addMarginFlag) { var icnEle = control.lastChild; if(icnEle.tagName.toLowerCase() == 'img'){ icnEle.style.marginTop = '0px'; } } }; </script>
<span id="$PHCClaimSearch$pServiceFromDateSpan" role="group" aria-label="Service From Date : " data-calendar="{"d":[0,0],"l":0}" style="display:inline-block; width:inherit;" onmouseover="pega.c.DatePicker.dtTmHvr(event);">
<input id="ServiceFromDate" class="inactvDtTmTxt" name="$PHCClaimSearch$pServiceFromDate" data-ctl="["DatePicker"]" data-formatting="yes" value="05/02/2017" data-value="5/2/2017" style="padding-right:17px;width:11.719em;" validationtype="date" data-change="[["refresh", ["thisSection","", "", "&=", "", ",",":event","","HCClaimSearch"]]]" data-display-value="05/02/2017" type="text"/>
<img class="inactvIcon" src="webwb/pzspacer_11792674401.gif!!.gif" data-ctl="["DatePicker"]" style="cursor:pointer;"/>
</span>
</nobr>
</td>
<td class="dataLabelWrite" style="height:24px;width:125px;">
<td class="dataValueWrite" style="height:24px;width:190px;">
<td class="dataLabelWrite" style="height:24px;width:101px;">
</tr>
</tbody>
</table>

Answer 1

The problem is with the HTML, at least as you've pasted here.
there are a number of places inside that tag that have double-quoted text inside of double-quoted text. e.g. the input element has the following attribute:
data-ctl="["DatePicker"]"
Other attributes I found with this problem: data-calendar, data-change
Once I corrected all of the places that this is a problem with outer single quotes, I was able to find the input using your Xpath from the Chrome developer tools
data-ctl='["DatePicker"]'

Answer 2

As you mentioned, you could catch the element till <nobr> tag and not further that is because the <ins> tag is having style="display: none;", so will use JavascriptExecutor to change the attribute and then send the text as follows :
((JavascriptExecutor)driver).executeScript("document.getElementById('pega-calendar').style.display='block';");
driver.findElement(By.xpath("//input[#id='ServiceFromDate']")).sendKeys("04242015");