Complex sentence: Sir John Woolf (1913-2000) and James Woolf (1919-1966) were two distinguished British film producers who founded the production companies Romulus Films and Remus Films, which were active during the 1950's and 1960's.
Split into simpler sentences: Sir John Woolf (1913--2000) and James Woolf (1919--1966) were two distinguished British film producers. They founded the production companies Romulus Films and Remus Films, which were active during the 1950's and 1960's.