Complex sentence: In 1910, the Department of the Naval Service was created to consolidate all naval services in Canada, becoming the Royal Canadian Navy in 1911 though some of these naval services, and vessels, were later returned to other departments.
Split into simpler sentences: In 1910, the Department of the Naval Service was created to consolidate all naval services in Canada, becoming the Royal Canadian Navy in 1911. In time many of these naval services, and vessels, were later returned to other departments.