Original sentence: Han is a research scientist for New York University's (NYU) Courant Institute of Mathematical Sciences, and one of the main developers of an "interface-free" touch-driven computer screen.The screen is based on "multi-touch sensing," which is similar to existing touch-screen interfaces but able to recognize multiple points of contact
Edited sentence: Han is a research scientist for New York University's (NYU) Courant Institute of Mathematical Sciences, and one of the main developers of "multi-touch sensing," which unlike older touch-screen interfaces was able to recognize multiple points of contact