Complex sentence: Populations that are considered to be genetically contaminated (containing hybrids) are exterminated.Rainbow and cutthroat trout are also genetically similar and cross-breed with Apache trout, compromising the genetic purity of each species.
Split into simpler sentences: Populations that are considered to be genetically contaminated (containing hybrids) are exterminated. Cutthroat trout are also genetically similar and cross-breed with Apache trout, compromising the genetic purity of each species.