Complex sentence: In 1977, Harvey Milk was elected city-county supervisor in San Francisco, becoming the third openly gay American elected to public office and the first in California, but both he and Mayor George Moscone were assassinated by former Supervisor Dan White the next year.
Split into simpler sentences: In 1977, Harvey Milk was elected city-county supervisor in San Francisco, becoming the third openly gay American elected to public office and the first in California. Both he and Mayor George Moscone were assassinated by former Supervisor Dan White the next year.