Complex sentence: Another noteworthy item is Steverson's involvement as an Operations Officer during the seizure of two Russian fishing vessels, the "Kolevan" and the "Lamut" for violating an international agreement prohibiting foreign vessels from fishing in United States territorial waters.
Split into simpler sentences: Another noteworthy item is Steverson's involvement as an Operations Officer durring the seizure of two Russian fishing vessels, the "Kolevan" and the "Lamut". They were seized for violating an international agreement that prohibited foreign vessels from fishing in United States territorial waters.