Complex sentence: The Maroons' president James Strachan had been the owner of the Wanderers in the 1900s and he attempted to secure the Wanderers name but negotiations failed, so the club was known by its official name, the Montreal Professional Hockey Club.
Split into simpler sentences: The Maroons' president James Strachan had been the owner of the Wanderers in the 1900s. He attempted to secure the Wanderers name, but negotiations failed, so the club was known by its official name, the Montreal Professional Hockey Club.