Complex sentence: A report in the BBC, calls Marion the "campaigning mother" who unlike her husband Ralph, remained loyal to the UK Labour Party, and is thought to have been a greater influence on the political development of her sons.
Split into simpler sentences: A report in the BBC, calls Marion the "campaigning mother" who unlike her husband Ralph, remained loyal to the UK Labour Party. However she is thought to have been a greater influence on the political development of her sons.