<QueryList>
<Query Id="0" Path="Microsoft-Windows-TaskScheduler/Operational">
<Select Path="Microsoft-Windows-TaskScheduler/Operational">*[EventData [@Name='TaskSuccessEvent'][Data[@Name='TaskName']='\TaskName']]</Select>
</Query>
</QueryList>
http://woshub.com/schedule-task-to-start-when-another-task-finishes/
Source:
Triggers 2nd Job:
Steps to schedule the trigger: