Complex sentence: However, Goulian called a friend--a Russian pilot named Sergey--who told them to compensate for the plane's abnormally large ailerons; using his advice on flying the real-world plane, the team found that the maneuver worked correctly.
Split into simpler sentences: However, Goulian called a friend--a Russian pilot named Sergey--who told them to compensate for the plane's abnormally large ailerons. Using his advice on flying the real-world plane, the team found that the maneuver worked correctly.