Complex sentence: Sacks received the position "Columbia Artist" from Columbia University in 2007, a post that was created specifically for him and that gave him unconstrained access to the university, regardless of department or discipline.
Split into simpler sentences: Sacks received the position "Columbia Artist" from Columbia University in 2007, a post that was created specifically for him. In this capacity he gained unconstrained access to the university, regardless of department or discipline.