Complex sentence: After sending in robots to confirm and attempt to make entry into the vehicle, they used water charges to breach the windshield and were able to verify that the suspect was the only person in the vehicle and he was deceased.
Split into simpler sentences: After sending in robots to confirm and attempt to make entry into the vehicle, water charges were used to breach the windshield. Police then verified that the suspect was the only person in the vehicle and that he was deceased.