Complex sentence: The original plans for a transition to an 18 hole golf course were laid out before the Second World War, however only 14 holes managed to be constructed before the start of the war and during the early war years advancements to the course were suspended.
Split into simpler sentences: The original plans for a transition to an 18-hole golf course were laid out before the Second World War. However, only 14 holes managed to be constructed before the start of the war, and during the early war years advancements to the course were suspended.