Complex sentence: Healy 2012,1 Crawford wrote another three-act play called Governor's Stables which entered a playwriting competition in 1951 and won the first prize which was one hundred and fifty pounds.
Split into simpler sentences: Healy 2012,1 Crawford wrote another three-act play called Governor's Stables which was entered into a playwriting competition in 1951. It won the first prize which was one hundred and fifty pounds.