Complex sentence: Harry Wilson was an English professional rugby league footballer of the 1900s, playing at representative level for Great Britain, and England, and at club level for Hunslet, as a, i.e. number 11 or 12, during the era of contested scrums.
Split into simpler sentences: Harry Wilson was an English professional rugby league footballer in the 1900's, playing at representative level for Great Britain, and England. He also played club level for Hunslet, as number 11 or 12, during the era of contested scrums.