Complex sentence: Voelker made his professional MMA debut in 2006, and competed in events primarily in Iowa and Kansas, amassing a record of 20-7 before signing with Strikeforce.
Split into simpler sentences: Voelker made his professional MMA debut in 2006. He competed in events primarily in Iowa and Kansas, amassing a record of 20 win and 7 losses before signing with Strikeforce.