Complex sentence: Prewitt has achieved one of the rarest feats in offshore ocean Billfishing when an Angler catches and releases any three of the five Billfish (Blue Marlin, White Marlin, Sailfish, Spearfish or Swordfish) within a single day.
Split into simpler sentences: Prewitt has achieved one of the rarest feats in offshore ocean Billfishing. This is when a Angler catches and releases any three of the five Billfish (Blue Marlin, White Marlin, Sailfish, Spearfish or Swordfish) within a single day.