Complex sentence: October 1, with Matthew achieving its peak intensity at Category 5 status by 00:00 UTC on October 1, making it the first such storm in the Atlantic basin since Felix in 2007.
Split into simpler sentences: October 1, with Matthew achieving its peak intensity at Category 5 status by 00:00 UTC on October 1. This made it the first such storm in the Atlantic basin since Felix in 2007.