Complex sentence: O'Hara never made a league appearance for Celtic, and later played for Queen of the South F.C., Motherwell, Falkirk and Partick Thistle in the Scottish Football League, and for the Washington Diplomats and the Jacksonville Tea Men in the North American Soccer League.
Split into simpler sentences: O'Hara never made a league appearance for Celtic, before Queen of the South F.C., the club to whom he gave his longest service. O'Hara then played for Motherwell, Falkirk and Partick Thistle in the Scottish Football League, and for the Washington Diplomats and the Jacksonville Tea Men in the North American Soccer League.