Complex sentence: Born Sandra Colleen Waites in Sydney, Australia, Harris was a student of NIDA acting school in 1961 and performed in the successful Sydney stage production of Boeing Boeing from 1964 to 1965.
Split into simpler sentences: Born Sandra Colleen Waites in Sydney, Australia, Cassandra Harris was a student at the NIDA. She went on to perform in the successful Sydney stage production of Boeing Boeing from 1964 to 1965.