Complex sentence: Due to the relatively light overall damage, the name Allison was not retired and re-used in 2001, though in 2001 it was retired and replaced with Andrea which was used in the 2007 season.
Split into simpler sentences: Due to the relatively light overall damage, the name Allison was not retired and re-used in 2001. However, in 2001, it was retired and replaced with Andrea which was used in the 2007 season.