Complex sentence: It was adapted from Laurents' 1952 play "The Time of the Cuckoo", which was the basis for the 1955 film "Summertime" starring Katharine Hepburn.
Split into simpler sentences: It was adapted from Laurents' 1952 play "The Time of the Cuckoo". The play was the basis for the 1955 film "Summertime" starring Katharine Hepburn.