Complex sentence: George Lewis was a professional rugby league footballer who played in the 1920s, 1930s, and 1940s, playing at club level for Castleford, and Featherstone Rovers (World War II guest) (Heritage № 237), as a, i.e. number 1.
Split into simpler sentences: George Lewis was a professional rugby league footballer who played in the 1920s, 1930s, and 1940s. He played at club level for Castleford, and Featherstone Rovers (World War II guest) (Heritage № 237), as a, i.e. number 1.