Complex sentence: Another branch of MacNabs supported the Jacobites and the House of Stuart, they were led by Allister MacNab of Inshewan and Archibald MacNab of Acharne.
Split into simpler sentences: Another branch of MacNabs supported the Jacobites and the House of Stuart. They were led by Allister MacNab of Inshewan and Archibald MacNab of Acharne.