Complex sentence: Three years later, in 1998, he toke the reins of the group COSIDER as CEO, assuming this responsibility until 2002, when he was elected MP for the region FLN in Algiers.
Split into simpler sentences: Three years later, in 1998, he will take the reins of the group COSIDER as CEO. He will assume this responsibility until 2002, when he was elected MP for the region FLN in Algiers.