Complex sentence: A veterinarian by training, he was an animal health technology instructor at Thompson Rivers University in Kamloops from 1997 to 2005, when he was elected mayor of Kamloops, having previously served on Kamloops City Council since 2002.
Split into simpler sentences: A veterinarian by training, he is an animal health technology instructor at Thompson Rivers University in Kamloops. Lake served as Mayor of Kamloops, British Columbia, Canada from 2005 to 2008, having previously served on Kamloops City Council since 2002.