Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: Lord Elis-Thomas left Plaid Cymru to sit as an independent AM because the party was not "serious" about taking part in the Labour-led Welsh Government, he has said.

Ex-leader Lord Elis-Thomas left Plaid Cymru over Labour stance