Complex sentence: James Starkey was a professional rugby league footballer who played in the 1920s, playing at club level for Warrington (Heritage № 261), as a, i.e. number 3 or 4.
Split into simpler sentences: James Starkey was a professional rugby league footballer who played in the 1920s. He played at club level for Warrington (Heritage № 261), as a, i.e. number 3 or 4.