Complex sentence: From its inception until 1979, the prima ballerina of Batsheva was Rina Schenfeld; she and Rena Gluck were the company's principal dancers for many years.
Split into simpler sentences: From its inception until 1979, the prima ballerina of Batsheva was Rina Schenfeld. She and Rena Gluck were the company's principal dancers for many years.