Complex sentence: Some American states have no unincorporated land areas; these include Connecticut, Massachusetts, New Jersey, Pennsylvania and Rhode Island, although these states all have communities that are not separately incorporated but are part of a larger municipality.
Split into simpler sentences: Some American states have no unincorporated land areas; these include Connecticut, Massachusetts, New Jersey, Pennsylvania and Rhode Island. These states all have communities that are not separately incorporated but are part of a larger municipality.