Definition: Rewrite each original sentence in order to make it easier to understand by non-native speakers of English. You can do so by replacing complex words with simpler synonyms (i.e. paraphrasing), deleting unimportant information (i.e. compression), and/or splitting a long complex sentence into several simpler ones. The final simplified sentences need to be grammatical, fluent, and retain the main ideas of their original counterparts without altering their meanings.
Input: All members of this genus were once considered part of the same species, Calomyscus bailwardi, but they are now referred to as separate species due to major differences in chromosome number, skull measurements, and other features.

Members with this gene were considered Calomyscus bailwardi, but now seen as a separate species by differences in chromosomes, skull measurements and other features.