Complex sentence: The airship company Zodiac began to develop inflatable rubber boats and in 1934 they invented the inflatable kayak and catamaran which led on to the modern day Zodiac inflatable boat.
Split into simpler sentences: The airship company Zodiac began to develop inflatable rubber boats, and in 1934, invented the inflatable kayak and catamaran. These led to the modern day Zodiac inflatable boat.