Complex sentence: St. John's International Airport is an international airport located northwest of St. John's, Newfoundland and Labrador, Canada that serves the St. John's Metro Area and the Avalon Peninsula.
Split into simpler sentences: St. John's International Airport is in Newfoundland and Labrador, Canada. It is an international airport located northwest of St. John's, Newfoundland and Labrador that serves the St. John's Metro Area and the Avalon Peninsula.