Complex sentence: Cody made many demonstrations of his system and would later sell four of his "war kite" systems to the Royal Navy before joining the newly-established Army Balloon Factory at Farnborough and manufacturing war kites for the British Army.
Split into simpler sentences: Cody made many demonstrations of his system and would later sell four of his "war kite" systems to the Royal Navy. He soon joined the newly-established Army Balloon Factory at Farnborough and continued developing his war kites for the British Army.