Complex sentence: At the culmination of the exhibition there is a charity gala auction where the finalists works, excluding the first prize winner, are auctioned, with half the proceeds going to the Foundation, and the other half going back to the artist.
Split into simpler sentences: At the culmination of the exhibition there is a charity gala auction. Here the finalists works, excluding the first prize winner, are auctioned, with half the proceeds going to the Foundation, and the other half going back to the artist.