Complex sentence: In the 1950s, he took over a chain of stores in Katanga Province and became involved in politics, founding the CONAKAT party with Godefroid Munongo which ran under a banner of an independent, federal Congo.
Split into simpler sentences: In the 1950s, he took over a chain of stores in Katanga Province and became involved in politics. He founded the CONAKAT party with Godefroid Munongo; the party promoted an independent, federal Congo.