Complex sentence: Those rebels who were arrested in Upper Canada following the 1837 uprisings were put on trial, with most being found guilty of insurrection against the Crown, and several of the ring-leaders were publicly hanged; most notably Samuel Lount and Peter Matthews.
Split into simpler sentences: Those rebels who were arrested in Upper Canada following the 1837 uprisings were put on trial, with most being found guilty of insurrection against the Crown, and several of the ring-leaders. Many were publicly hanged; most notably Samuel Lount and Peter Matthews.