Complex sentence: Upon their retirement all combat ships of the navy were based at Naval Base Simon's Town and the Durban base was reduced to a naval station in 2002, some of the facilities of the base were then taken over by the army as a general support base.
Split into simpler sentences: Upon their retirement all combat ships of the navy were based at Naval Base Simon's Town and the Durban base was reduced to a naval station in 2002. Some of the facilities of the base were then taken over by the army as a general support base.