Complex sentence: However, in autumn of 1990 as Soviet Union was collapsing, they were moved to Lebanon and sheltered by Walid Jumblatt, head of the Progressive Socialist Party, a Druze-based party and ally of the Soviet Union.
Split into simpler sentences: However, in autumn of 1990 as Soviet Union was collapsing, they were moved to Lebanon. Jumblatt was head of the Progressive Socialist Party, a Druze-based party and ally of the Soviet Union.