Original sentence: Thief was designed to function as a lightly scripted game; events occur naturally as opposed to pre-defined sequences written by a programmer.Thief was specifically designed to increase the player's ability to "just pick [it] up and start playing", as their previous games "require a fair amount of investment from the player to get maximal enjoyment"
Edited sentence: They also specifically designed the game to increase the player's ability to "just pick [it] up and start playing", as their previous games "require a fair amount of investment from the player to get maximal enjoyment".Thief was designed to function as a lightly scripted game; events occur naturally, as opposed to pre-defined sequences written by a programmer