Complex sentence: He was a left-handed batsman who played for New South Wales from 1968 until retirement in 1978, he scored over 5,700 runs as a stocky opener with a practised cut shot, though he was not able to prove his abilities at best at international level.
Split into simpler sentences: He was a left-handed batsman who played for New South Wales from 1968 until retirement in 1978. He scored over 5,700 runs as a stocky opener with a practised cut shot, though he was not able to prove his abilities at best at international level.