Complex sentence: Lee's ballot measure to raise the minimum wage was passed overwhelmingly by the San Francisco voters in November 2014 that gradually increases San Francisco's minimum wage to $15 per hour by 2018.
Split into simpler sentences: Lee's ballot measure to raise the minimum wage was passed overwhelmingly by the San Francisco voters in November 2014. This will gradually increase San Francisco's minimum wage to $15 per hour by 2018.