Complex sentence: Against this position other biogerontologists argue that premature aging phenotypes as identifiable symptoms associated with mechanisms of moleular damage which are widely accepted to underly aging justify classification of the relevant diseases as "accelerated aging".
Split into simpler sentences: Against this position other biogerontologists argue that premature aging phenotypes are identifiable symptoms associated with mechanisms of moleular damage. The fact that these phenotypes are widely recognized justifies classification of the relevant diseases as "accelerated aging".