Complex sentence: Until 1971, the Republic of China was permanent member of the UN Security Council with veto rights; since then, however, it was excluded in favor of the People's Republic of China, and since 1972, from all UN-subcomittees as well.
Split into simpler sentences: Until 1971, the Republic of China was permanent member of the UN Security Council with veto powe. Since then, however, it was excluded in favor of the People's Republic of China, and since 1972, it was excluded from all UN-subcomittees as well.