Complex sentence: In the early 1980's he worked at Exeter University in the theatre department, and then as an Associate Director at Manchester's Royal Exchange Theatre between 1985 and 1989, and at the National Theatre in London between 1989 and 1997.
Split into simpler sentences: In the early 1980's he worked at Exeter University in the theatre departmentelf. Hytner then found hims at the National Theatre in London between 1989 and 1997.