Complex sentence: One of those most opposed to this partition settlement was the leader of Irish unionism, Dublin-born Sir Edward Carson, who felt that it was wrong to divide Ireland in two, and felt this would badly affect the position of southern and western unionists.
Split into simpler sentences: One of those most opposed to this partition settlement was the leader of Irish unionism, Dublin-born Sir Edward Carson, who felt that it was wrong to divide Ireland in two. He felt this would badly affect the position of southern and western unionists.