Complex sentence: McGovern lost several primaries, including Florida to George Wallace, where the southerner's "outsider" image, did well in the South (he won every single county in the Florida primary) and among alienated and dissatisfied voters.
Split into simpler sentences: McGovern lost several primaries, including Florida to George Wallace. Due to the southerner's "outsider" image, did well in the South (he won every single county in the Florida primary) and among alienated and dissatisfied voters.