Complex sentence: In 1989, he became a leader of the reformist movement within the Romanian Communist Party, and was part of the council that administered Romania in 1990 from the overthrow of the Nicolae Ceauşescu government until elections could be held.
Split into simpler sentences: In 1989, he became a leader of the reformist movement within the Romanian Communist Party. After the Romanian Revolution of 1989, he was part of the council that administered Romania in 1990 from the overthrow of the Nicolae Ceauşescu government until elections could be held.