Complex sentence: He has written 21 books which have been translated into 27 different languages, and have been sold in 115 different countries, several of which have appeared in the "New York Times" bestseller list.
Split into simpler sentences: He has written 21 books which have been translated into 27 different languages, and have been sold in 115 different countries. Several of which have appeared in the "New York Times" bestseller list.