Complex sentence: As tensions grew between the two factions Lumumba, sought help from the United Nations and on July 17,1960 Resolution 143 was adopted, which called for Belgium to remove its military personnel from the Congo.
Split into simpler sentences: As tensions grew between the two factions Lumumba, sought help from the United Nations and on July 17,1960 Resolution 143 was adopted. This resolution called for Belgium to remove all its military personnel from the Congo.