Complex sentence: Originally to be launched on 13 November 2003 to the International Space Station to conduct assembly mission ISS-13A.1, delivering the Spacehab Single Cargo Module, station supplies, and the third starboard truss segment (ITS S5).
Split into simpler sentences: Originally to be launched on 13 November 2003 to the International Space Station to conduct assembly mission ISS-13A.1. It would have delivered the Spacehab Single Cargo Module with station supplies, and the third starboard truss segment (ITS S5).