Complex sentence: The Shinnecock are believed to have spoken an Algonquain Y-dialect, similar to the Niantic, Montaukett, and Narragansett, unlike their western neighbours who most likely spoke an R-dialect, like the Wappinger and western Connecticut tribes.
Split into simpler sentences: The Shinnecock are believed to have spoken an Algonquain Y-dialect, similar to the Niantic, Montaukett, and Narragansett. Their western neighbors most likely spoke an R-dialect, like the Wappinger and western Connecticut tribes.