Complex sentence: Cox played his high school hockey at Archbishop Williams High School in Braintree, MA, USA and is one of the best players in program history.Cox the played NCAA hockey with the New Hampshire Wildcats men's ice hockey team.
Split into simpler sentences: Cox played his high school hockey at Archbishop Williams High School in Braintree, MA, USA and is one of the best players in program history. Cox then played NCAA hockey with the New Hampshire Wildcats men's ice hockey team.