Complex sentence: At the University of Chicago and many other locations, this assembler was replaced by one which packed the output only of pass one at several instructions per card, and other assemblers were written which placed the pass one output in memory for small programs.
Split into simpler sentences: At the University of Chicago and many other locations, this assembler was replaced by one which packed the output of pass one into several instructions per card. Other assemblers were written which placed the pass one output into memory for small programs.