Complex sentence: Frank Williams is an English professional rugby league footballer who played in the 1920s, and 1930s, playing at representative level for England, and at club level for Warrington, as a loose forward/lock, i.e. number 13, during the era of contested scrums.
Split into simpler sentences: Frank Williams is an English professional rugby league footballer who played in the 1920s, and 1930s. He played at representative level for England, and at club level for Warrington, as a loose forward/lock, i.e. number 13, during the era of contested scrums.