Complex sentence: "Summertime" is a song by R&B singer Beyoncé featuring rapper P. Diddy, released as the second and final single to promote the film "The Fighting Temptations" in 2003, in which Beyoncé plays the leading lady.
Split into simpler sentences: Summertime is a single released by R&B singer Beyoncé featuring rapper P. Diddy in 2003. The song was the second and final single released to promote the film "The Fighting Temptations", in which Knowles plays the leading lady.