Complex sentence: The Latécoère 380 was a flying boat built in France in 1928 for use on Aéropostale's mail routes to South America and which later saw military service as a maritime patrol aircraft.
Split into simpler sentences: The Latécoère 380 was a flying boat airplane built in France in 1928 for use on Aéropostale's mail routes to South America. The plane later saw military service as a maritime patrol aircraft.