Question: What two kickboxing organizations did the brother of Valentin Overeem hold titles in at the same time?
Sentence (from "Valentijn Overeem"): A professional competitor since 1996, he has previously fought for the PRIDE Fighting Championships, RINGS, KSW, the World Fighting Alliance, K-1, M-1 Global, Its Showtime, World Victory Road, and Strikeforce.
Relevant evidence: No