Complex sentence: John Shaw was a professional rugby league footballer who played in the 1910s, playing at club level for Warrington (Heritage № 204), as a, i.e. number 3 or 4.
Split into simpler sentences: John Shaw was a professional rugby league footballer who played in the 1910s. He played at club level for Warrington (Heritage № 204), as a, i.e. number 3 or 4.