Complex sentence: David "Dave" Hawley is a professional rugby league footballer who played in the 1960s, and 1970s, playing at club level for Wakefield Trinity (Heritage № 719), as a, i.e. number 13, during the era of contested scrums.
Split into simpler sentences: David "Dave" Hawley is a former professional rugby league footballer who played in the 1960s, and 1970s. He played at club level for Wakefield Trinity (Heritage № 719), as a, i.e. number 13, during the era of contested scrums.