Complex sentence: The discovery of three human enterotypes was announced in the April 2011 issue of "Nature" by Peer Bork and his associates, they found enterotypes are not dictated by age, gender, body weight, or national divisions.
Split into simpler sentences: The discovery of three human enterotypes was announced in the April 2011 issue of "Nature" by Peer Bork and his associates. They found that enterotypes are not dictated by age, gender, body weight, or national divisions.