Complex sentence: His son, George Cornelius "Con" O'Kelly Jr., appeared for the British team as a boxer in the heavyweight category at the 1924 Summer Olympics in Paris, France.
Split into simpler sentences: His son, George Cornelius "Con" O'Kelly Jr., also went on to represent Great Britain at the Olympics. He appeared for the British team as a boxer in the heavyweight category at the 1924 Summer Olympics in Paris, France.