Complex sentence: Dennison (1976) saw it as a legitimate expression of Republicanism in the United States, but concluded that politics changed little for Rhode Islanders after 1842 because the same groups ruled the state.
Split into simpler sentences: Dennison (1976) saw it as a legitimate expression of Republicanism in the United States. However, he concluded that politics changed little for Rhode Islanders after 1842 because the same groups ruled the state.