Complex sentence: An Air Accident Investigation report concluded that Smith was 5 times over the blood alcohol prescribed limit, this along with unreliable instrument readings and lack of IMC or instrument rating lead to disorientation and the crash.
Split into simpler sentences: An Air Accident Investigation report concluded that Smith was five times over the blood alcohol prescribed limit. This, along with unreliable instrument readings and his lack of IMC or instrument rating, lead to disorientation and the crash.