Complex sentence: Alfred "Alf" Milnes was a professional rugby league footballer who played in the 1920s, playing at representative level for Great Britain, and at club level for Halifax, as a, i.e. number 9, during the era of contested scrums.
Split into simpler sentences: Alfred "Alf" Milnes was a professional rugby league footballer who played in the 1920s. He played at representative level for Great Britain, and at club level for Halifax, as a, i.e. number 9, during the era of contested scrums.