Complex sentence: Evacuation was carried out and all passengers and flight attendants were off in less than 45 seconds, though every flight attendant suffered some injury during the evacuation, ranging from scratches to a dislocated shoulder.
Split into simpler sentences: Evacuation was carried out, and all passengers and flight attendants were off in less than 45 seconds. Every flight attendant suffered some injury during the evacuation, however, ranging from scratches to a dislocated shoulder.