Complex sentence: The airline was nominally established in, serving as the ground handling agent at Asmara International Airport and at Assab and Massawa, and as sales agent for other major airlines flying to Eritrea.
Split into simpler sentences: The airline was nominally established in, serving as the ground handling agent at Asmara International Airport and at Assab and Massawa. It also acted as sales agent for other major airlines flying to Eritrea.