Complex sentence: With the rise of Hitler, the family returned to the United States and he attended Dartmouth College in 1934 and won at Sestriere, Italy, the first American to dominate at a major European ski race.
Split into simpler sentences: With the rise of Hitler the family returned to the United States. He attended Dartmouth College in 1934 and won at Sestriere, Italy, the first American to dominate at a major European ski race.