Complex sentence: Harold Chapman was a professional rugby league footballer who played in the 1920s, and 1930s, playing at club level for Castleford as a, i.e. number 2 or 5.
Split into simpler sentences: Harold Chapman was a professional rugby league footballer who played in the 1920s, and 1930s. He played at club level for Castleford as a, i.e. number 2 or 5.