Complex sentence: There were many outstanding individual reform politicians in Upper Canada, including Robert Randal, Peter Perry, Marshall Spring Bidwell, William Ketchum and Dr. William Warren Baldwin; however, organized collective reform activity began with Robert Fleming Gourlay.
Split into simpler sentences: There were many outstanding individual reform politicians in Upper Canada, including Robert Randal, Peter Perry, Marshall Spring Bidwell, William Ketchum and Dr. William Warren Baldwin. However, organized collective reform activity began with Robert Fleming Gourlay.