Complex sentence: The high school had one of the strongest performing arts programs in the city and included among its alumni singers Barbra Streisand and Stephanie Mills, and record company executives Clive Davis, who founded Arista Records, and Kedar Massenburg, who later became president of Motown Records.
Split into simpler sentences: The high school had one of the strongest performing arts programs in the city. Record company executives Clive Davis, who founded Arista Records, and Kedar Massenburg, who later became president of Motown Records.