Complex sentence: The Marines trained and fielded a small reconnaissance detachment between 1983 and 1988; based at 111 Harbour Protection Unit (HPU) on Red Hill above Simonstown, they received airborne, diver and urban counter meassures training from other army units within the SADF.
Split into simpler sentences: The Marines trained and fielded a small reconnaissance detachment between 1983 and 1988. Based at 111 Harbour Protection Unit (HPU) on Red Hill above Simonstown, they received airborne, diver and urban counter meassures training from other army units within the SADF.