Complex sentence: The Presbyterian Church in Canada is the name of a Protestant Christian denomination, of Presbyterian and reformed theology and polity, serving in Canada under this name since 1875, although the United Church of Canada claimed the right to the name from 1925 to 1939.
Split into simpler sentences: The Presbyterian Church in Canada is a Presbyterian denomination, serving in Canada under this name since 1875. The United Church of Canada claimed the right to the name from 1925 to 1939.