Complex sentence: Pertwee also spent 18 years (1959--1977) playing Chief petty officer Pertwee in "The Navy Lark" on BBC Radio, he later played the title character in the series "Worzel Gummidge" from 1979 to 1981, and again in 1987 to 1989.
Split into simpler sentences: Pertwee also spent 18 years (1959--1977) playing Chief petty officer Pertwee in "The Navy Lark" on BBC Radio. He later played the title character in the series "Worzel Gummidge" from 1979 to 1981, and again in 1987 to 1989.