Complex sentence: Computed tomography (CT) scans are considered the gold standard in imaging in major trauma cases, however they may only be performed in people with relatively stable blood pressure, heart rate, and sufficient oxygenation.
Split into simpler sentences: Computed tomography (CT) scans are the gold standard in imaging in major trauma. They however may only be performed in people with a relatively stable blood pressure, heart rate, and sufficient oxygenation.