Complex sentence: The Commanding officer of Fort Malden, Captain Hector McLean, decided to give it to the "Schooner Nancy" instead thus it was held by her owners: her Captain, William Mills and the Montreal firm Forsyth, Richardson and Company.
Split into simpler sentences: The Commanding officer of Fort Malden, Captain Hector McLean, decided to give it to the "Schooner Nancy" instead. Thus it was held by her owners: her Captain, William Mills and the Montreal firm Forsyth, Richardson and Company.