Complex sentence: The major force of the Cubans, still on the way, never saw action and returned to Tchipa and with the retreat of the SADF into Namibia an 27 June the hostilities ceased.
Split into simpler sentences: The major force of the Cubans, still on the way, never saw action and returned to Tchipa. With the retreat of the SADF into Namibia an 27 June the hostilities ceased.