Complex sentence: By early 1961 Shane and Reynolds had found a replacement for Guard, John Stewart; and after a reportedly acrimonious meeting with Shane, Reynolds, and the Trio's business manager Frank Werber over the future of the Trio, Guard quit the group.
Split into simpler sentences: By early 1961 Shane and Reynolds had found a replacement for Guard. After a reportedly acrimonious meeting with Shane, Reynolds, and the Trio's business manager over the future of the Trio, Guard quit the group.