Complex sentence: Some evidence points to catastrophe promoting proteins, or "catatrophins", being invovled in catastrophe by by binding to the ends of microtubule and promoting the dissociation of tubulin dimers.
Split into simpler sentences: Some evidence points to catastrophe-promoting proteins, or "catastrophins", being invovled. These protein promote catastrophe by binding to the ends of microtubule and promoting the dissociation of tubulin dimers.