Complex sentence: The project had been started by Aldus, was code-named Shuksan "first, later" K2 and was released as InDesign 1.0 in 1999.
Split into simpler sentences: The project had been started by Aldus and was code-named "Shuksan" first. It was later code-named "K2" and was released as InDesign 1.0 in 1999.