Complex sentence: Additionally, the South African Defence Force engaged the MPLA forces in Moxico in February 1972, destroying the Communist presence, and helped the Portuguese Armed Forces in a successful campaign to control and pacify the entire Eastern Front (the Frente Leste).
Split into simpler sentences: Additionally, the South African Defence Force engaged the MPLA forces in Moxico in February 1972, destroying the Communist presence. The Portuguese Armed Forces organized a successful campaign to control and pacify the entire Eastern Front (the Frente Leste).