Complex sentence: In the popular clicker/idle game "Clicker Heroes", a grue may be one of causes of death to the player's mercenaries, stating that the mercenary was "eaten by a grue".
Split into simpler sentences: In the popular clicker/idle game "Clicker Heroes", a grue may be one of causes of death to your mercenaries. The game tells you that the mercenary was "eaten by a grue".