Complex sentence: While working as an elevator operator and bellboy at the Illinois Athletic Club, Weissmuller caught the eye of swim coach William Bachrach, who trained Weissmuller and in August 1921, Weissmuller won the national championships in the 50-yard and 220-yard distances.
Split into simpler sentences: While working as an elevator operator and bellboy at the Illinois Athletic Club, Weissmuller caught the eye of swim coach William Bachrach. Bachrach trained Weissmuller and in August 1921, Weissmuller won the national championships in the 50-yard and 220-yard distances.