Complex sentence: During World War II, between 1942-1944, shilling production was supplemented by coinage produced at the San Francisco branch of the United States Mint, which bear a small S below the ram's head.
Split into simpler sentences: During World War II, between 1942-1944, Shilling production was supplemented by coinage produced by the United States Mint with coins produced at the San Francisco mint. Coins minted at the San Francisco mint contain a small S below the ram's head.