Complex sentence: With this decisive win, Johnson became the first Democratic presidential candidate to ever win Vermont, and this traditional Republican stronghold even weighed in as 10% more Democratic than the national average in the 1964 election.
Split into simpler sentences: With this decisive win, Johnson became the first Democratic presidential candidate to ever win Vermont. Johnson's landslide margin of victory in this traditional Republican stronghold even made the state 10% more Democratic than the national average in the 1964 election.