Complex sentence: On September 3,1890, Harry became the first player to hit 100 homers for a career, off of Jersey Bakely in a game against Cleveland, a significant milestone in a day when home runs were relatively rare.
Split into simpler sentences: On September 3,1890, Harry became the first player to hit 100 homers for a career, off of Jersey Bakely in a game against Cleveland. A major milestone in a day when home runs were relatively rare.