Complex sentence: Since 2006 Canoe Lake has been a venue for the Lake of Lights Memorial Service, held each December, when thousands of lights are floated on the lake to commemorate loved ones in the local community who have been lost to cancer.
Split into simpler sentences: Since 2006 Canoe Lake has been used as a venue for the annual Lake of Lights Memorial Service. This happens in December where thousands of lights are floated on the lake to commemorate loved ones in the local community who have been lost to cancer.