Complex sentence: The team also realized that players spent a lot of time interacting with the open world of "Far Cry 3", and decided to put more effort and resources into the world's design and add more quests to the game.
Split into simpler sentences: The team also realized that players spent a lot of time interacting with the open world of "Far Cry 3". Therefore, the team put more effort and resources into the world's design and added more quests to the game.