Complex sentence: In biology, the goal of comparing genetic sequences is to determine the percentage of similarity between the chromosomes of two species; they may then be hypothesized to have branched from each other on the tree at a time consistent with the rate of change of each.
Split into simpler sentences: In biology, the goal of comparing genetic sequences is to determine a percentage of similarity between the chromosomes of two species. They may then be hypothesized to have branched from each other in the tree at a time that is consistent with the rate of change of each.