Complex sentence: The earliest known provision for cidermaking is believed to have been carried on the Mayflower itself in 1620-halfway through the journey, the ship was caught in a storm and one of its beams cracked badly enough to warrant the consideration of turning back to England.
Split into simpler sentences: The earliest known provision for cidermaking is believed to have been carried on the Mayflower itself in 1620. Halfway through the journey, the ship was caught in a storm and one of its beams cracked badly enough to warrant the consideration of turning back to England.