Simplify the following text for a Grade 9 native English-speaking person.
Original: Gaedel entered the second half of the doubleheader between the Browns and Detroit Tigers in the bottom of the first inning as a pinch-hitter for leadoff batter Frank Saucier .
Simplified: Eddie Gaedel entered the game between the Browns and Detroit Tigers as a pinch-hitter for leadoff batter Frank Saucier .