Complex sentence: Passengers traveling via Delta Air Lines and departing from JFK's Terminal 3, are checked-in at the Downtown Manhattan Heliport, where they obtain boarding passes and baggage receipts to their final destination.
Split into simpler sentences: Passengers traveling via Delta Air Lines and departing from JFK's Terminal 3 are checked-in at the Downtown Manhattan Heliport. There, they obtain boarding passes and baggage receipts to their final destination.