Complex sentence: Similarity forest (also known as SimForest) is a generalization of the random forest classification model, since it has the ability to create classification models with the use of only pairwise similarities between objects.
Split into simpler sentences: Similarity forest (also known as SimForest) is a generalization of the random forest classification model. Unlike the random forest, however, it has the ability to create a classification model with the use of only pairwise similarities between objects.