Please help me correct this sentence
In this form all pending resignations of Employees coming under this particular Line Manager will be displayed,
When a user selects a particular LM, this form displays all the pending resignation requests of employees who report to that LM.
Bravo! Some people might object to 'this form displays'; you could avoid that problem by saying 'this form shows' or 'this form lists'. Otherwise, your rewrite is a great improvement.