Complex sentence: The first flight from the Marine Air Terminal by a Clipper departed on March 31,1940, carrying a crew of 10, nine passengers and over 5,000 pounds (2,300 kg) of mail and landed in Lisbon, Portugal 18 hours and 30 minutes later.
Split into simpler sentences: The first flight from the Marine Air Terminal by a Clipper departed on March 31,1940, carrying a crew of 10, nine passengers and over 5,000 pounds (2,300 kg) of mail. It landed in Lisbon, Portugal 18 hours and 30 minutes later.