Complex sentence: Thomas was hired by notables such as Raquel Welch, Barbra Streisand, Emma Thompson, and Woody Allen; as well as by Grace Kelly following her engagement to Prince Rainier of Monaco to meet her need to learn French rapidly.
Split into simpler sentences: Thomas was hired by notable people such as Raquel Welch, Barbra Streisand, Emma Thompson and Woody Allen. He was hired by Grace Kelly following her engagement to Prince Rainier of Monaco to meet her need to learn French rapidly.