Complex sentence: Along with Powell Lake, it was named for Dr. Israel Wood Powell, a medical doctor and educator and veteran of the Cariboo Gold Rush, who was Commissioner for Indian Affairs for British Columbia from 1873 to 1881.
Split into simpler sentences: Along with Powell Lake, it was named for Dr. Israel Wood Powell, a medical doctor and educator who was a veteran of the Cariboo Gold Rush. Dr. Powell was Commissioner for Indian Affairs for British Columbia from 1873 to 1881.