Complex sentence: Jim Hart served in the Canadian Forces twice, first for 5 years in the navy training as a Electrical Technician serving on 3 of Her Majesty's Canadian Ship's (HMCS) Gatineau, Qu'Appelle and Yukon.
Split into simpler sentences: Jim Hart served in the Canadian Forces twice, first for 5 years in the navy. After training as an Electrical Technician Hart served on 3 of Her Majesty's Canadian Ship's (HMCS) Gatineau, Qu'Appelle and Yukon.