Complex sentence: On December 29, Royal Navy Commander Andrew Drew and seven boatloads of Canadian militiamen cross the Niagara River to Fort Schlosser and capture the American supply steamer "Caroline" used by William Lyon Mackenzie and his rebels on Navy Island (see Caroline Affair).
Split into simpler sentences: On December 29, Royal Navy Commander Andrew Drew and seven boatloads of Canadian militiamen crossed the Niagara River to Fort Schlosser. They captured the American supply steamer "Caroline" used by William Lyon Mackenzie and his rebels on Navy Island (see Caroline Affair).