Complex sentence: Maneephan began her cycling career as a track cyclist before switching to road racing and was the gold medalist in the women's road race competition during the 2009 Southeast Asian Games (SEA Games).
Split into simpler sentences: Maneephan began her cycling career as a track cyclist. She switched to road racing and was the gold medalist in the women's road race competition during the 2009 Southeast Asian Games (SEA Games).