Complex sentence: Giorgio A. Tsoukalos (born March 19,1978) is a Swiss-born Greek writer, television personality, and proponent of the idea that ancient alien astronauts interacted with ancient humans.
Split into simpler sentences: Giorgio A. Tsoukalos (born March 19,1978) is a Swiss-born Greek writer and television personality. He is a proponent of the idea that ancient alien astronauts interacted with ancient humans.