Complex sentence: However, upon Somare's return, he challenged the decision to dismiss in the Supreme Court, which said that he was wrongfully dismissed; however, a majority or parliamentarians support O'Neill as the legitimate leader.
Split into simpler sentences: However, upon Somare's return he challenged the decision to dismiss in the supreme court. The supreme court upheld the view that he was wrongfully dismissed; however, a majority or parliamentarians support O'Neill as the legitimate leader.