Complex sentence: Ala Littoria routes in 1940 grew to 37110 kms mainly in the Mediterranean and African area and this accomplishment made the airline the fifth in the world (after the USA, URSS, Germany and UK's national airlines).
Split into simpler sentences: Ala Littoria routes in 1940 grew to 37,110 km, mainly in the Mediterranean and Africa. This accomplishment made the airline the fifth in the world (after the USA, URSS, Germany and UK's national airlines).