Complex sentence: On January 20, Secretary of Defense Ash Carter made a statement honoring the missing crew members (presumed dead) and thanking the Air Force, Coast Guard, Navy, and Marine personnel in their involvement in rescue operations.
Split into simpler sentences: On January 20, Secretary of Defense Ash Carter made a statement honoring the crew members. Carter thanked the Air Force, Coast Guard, Navy, and Marine personnel in their involvement in rescue operations.