<apex:pageBlockTable value="{!MapOfFieldDataTrack}" var="item"  >
                    <apex:column value="{!objects}"/>
                    <apex:column value="{!item}"/>
                    <apex:column>
                        <apex:repeat value="{!MapOfFieldDataTrack[item]}" var="updateRec">
                            {!updateRec} <br/>
                        </apex:repeat>
                    </apex:column>

          </apex:pageBlockTable>

key1 value1
key1 value2
key1 value3

Set<String> keyValues = yourMap.keySet();

<apex:repeat value="{!keyValues }" var="key">
    <apex:column headerValue="{!key}"/> <!-- key --->
    <apex:column value="{!yourMap[key]}"/> <!-- Value--->
</apex:repeat>

<apex:pageBlockTable value="{!MapOfFieldDataTrack}" var="item"  >
                <apex:column value="{!item}"/>  <!-- key --->
                <apex:column value="{!MapOfFieldDataTrack[item]}"/>  <!-- Value--->
      </apex:pageBlockTable>