Complex sentence: They dispatched a high-level diplomatic delegation to Ireland to discuss the impact of the spill which included experts in the field and Vice-Admiral Vyacheslav Popov, the deputy commander of the Russian Navy.
Split into simpler sentences: They dispatched a high-level diplomatic delegation to Ireland to discuss the impact of the spill. The delegation included experts in the field and Vice-Admiral Popov, the deputy commander of the Russian Navy.