Complex sentence: There were at least 22 major Spacelab missions between 1983 and 1998, and Spacelab hardware was used on a number other missions, with some of the Spacelab pallets being flown as late as 2008.
Split into simpler sentences: There were at least 22 major Spacelab missions between 1983 and 1998. In addition, some hardware like the used on a number other missions, and some of the Spacelab pallets were flown as late as 2008.