Complex sentence: Jack Spencer was an English professional rugby league footballer who played in the 1900s, playing at representative level for Great Britain, and England, and at club level for Salford, as a, i.e. number 8 or 10, during the era of contested scrums.
Split into simpler sentences: Jack Spencer was an English professional rugby league footballer who played in the 1900s. He played at representative level for Great Britain, and England, and at club level for Salford, as a, i.e. number 8 or 10, during the era of contested scrums.