Original: A few days later, Gimnasia was eliminated from the Copa Sudamericana by the Chilean champions Colo Colo, following a quarter final match where a player of Gimnasia was injured by a piece of cement thrown by Chilean supporters.
Simplified: A few days later, Gimnasia was eliminated from the Copa Sudamericana by the Chilean champions Colo Colo, following a quarter final match where a player of Gimnasia was injured by a cement piece thrown by Chilean supporters.