A 28-year-old man is brought to the emergency department following a motor vehicle collision. He was the driver and struck a tree at high speed. On arrival, his blood pressure is 95/62 mmHg, heart rate 118/min, and respiratory rate 22/min. Abdominal examination reveals a rigid, distended abdomen with severe tenderness in the epigastrium and left upper quadrant. Focused Assessment with Sonography for Trauma (FAST) shows free fluid in the pelvis and perihepatic space. A contrast-enhanced CT scan of the abdomen reveals a shattered spleen with active arterial bleeding and a laceration of the pancreatic body with ductal disruption. What is the most appropriate next step in management?