Complex sentence: There are many chess engines such as Crafty, Fruit and GNU Chess that can be downloaded from the Internet for free, and play a game that when run on any up-to-date personal computer, can defeat most master players under tournament conditions.
Split into simpler sentences: There are many chess engines such as Crafty, Fruit and GNU Chess that can be downloaded from the Internet for free. These engines are able to play a game that, when run on an up-to-date personal computer, can defeat most master players under tournament conditions.