How do I split a shape into 2 objects?

I am creating free hand drawn shapes which will be text boxes (subheading + text) or article chunks, and I want to apply envelope distort only for the subheading (section 1), or envelope distort with different settings for section 1 and section 2, 2 being the body text part of the article chunk.
How do I separate a shape into 2 sections so I could apply envelope distort with different settings for the 2 sections?
