Complex sentence: Zipser started the FreeFly movement in the late 1980s when he began experimenting with non-traditional forms of body flight, and has been part of growing the sport of FreeFly around the world-to the Fédération Aéronautique Internationale competition level that it is at today.
Split into simpler sentences: Zipser started the FreeFly movement in the late 1980s, when he began experimenting with non-traditional forms of body flight. Since then, he has been part of the worldwide sport of FreeFly, and has helped it grow to the Fédération Aéronautique Internationale competition level that it is at today.