Simplify the following text for a Grade 8 native English-speaking person.
Original: Sinclair edited Corman 's directorial debut , Swamp Women , and went on to work on at least a dozen of his films including Day the World Ended , The Intruder , Thunder Alley , The Raven and The Trip .
Simplified: From 1955 on , Sinclair worked together with director Roger Corman . Together they edited films like Swamp Women , Day the World Ended , The Intruder , The Raven and The Trip .