Complex sentence: Jimmy Williams was a professional rugby league footballer who played in the 1920s, playing at club level for Featherstone Rovers (Heritage № 13), as a, i.e. number 6.
Split into simpler sentences: Jimmy Williams was a professional rugby league footballer who played in the 1920s. He played at club level for Featherstone Rovers (Heritage № 13), as a, i.e. number 6.