Complex sentence: Over the next five years, Kasa-Vubu presided over a succession of weak governments, in July 1964 appointing former Katangan secessionist leader Moise Tshombe prime minister to use European mercenaries against leftist rebels.
Split into simpler sentences: Over the next five years, Kasa-Vubu presided over a succession of weak governments. In July 1964 he appointed former Katangan secessionist leader Moise Tshombe as prime minister and permitted the use of European mercenaries against leftist rebels.