Complex sentence: In 1976 she starred in "The Cassandra Crossing", a classic disaster film featuring such veteran stars as Richard Harris, Martin Sheen, and Ava Gardner, it fared extremely well internationally, it was also a respectable box office success in US market.
Split into simpler sentences: In 1976 she starred in "The Cassandra Crossing", a classic disaster film featuring such veteran stars as Richard Harris, Martin Sheen, and Ava Gardner. It fared extremely well internationally, and was a respectable box office success in US market.