Complex sentence: Officially released from the Group, Robert Lewis went off to join other Group members in Hollywood, including Group founder HArold Clurman, and in April of 1937, Lee Strasberg and Cheryl Crawford resigned as directors.
Split into simpler sentences: Officially released from Group obligations, many of the members, including Lewis and Group founder Harold Clurman, went off to join other Group members already in Hollywood. In April of 1937, Lee Strasberg and Cheryl Crawford resigned as directors.