Complex sentence: From 1964 to 1995 he was at Bell Laboratories in Murray Hill, there from 1985 to 1989 as director of the department of theoretical physics and there from 1989 to 1995 as "Distinguished Member of Technical Staff".
Split into simpler sentences: From 1964 to 1995 he was at Bell Laboratories in Murray Hill. From 1985 to 1989, he was director of the department of theoretical physics and from 1989 to 1995 he was "Distinguished Member of Technical Staff".