Complex sentence: The vermiform appendix has been proposed to be the shrunken remainder of the cecum that was found in a remote ancestor of humans, but a 2013 study refutes the idea of an inverse relationship between cecum size and appendix size and presence.
Split into simpler sentences: The vermiform appendix has been proposed to be the shrunken remainder of the cecum that was found in a remote ancestor of humans. A 2013 study, however, refutes the idea of an inverse relationship between cecum size and appendix size and presence.