Complex sentence: Ayer collaborated on the script for "The Fast and the Furious" in 2001 and afterwards, signed a contract to write a script for "S.W.A.T.", which was based on his original story pitch.
Split into simpler sentences: Ayer collaborated on the script for "The Fast and the Furious" in 2001. Ayer signed a contract to write a script for "S.W.A.T.", which was based on his original story pitch.