Complex sentence: Klein resonances have been proposed using the mass couplings of such resonances with the top quark, however, until the Large Hadron Collider (LHC) reaches full operational power, observation of such resonances are unlikely.
Split into simpler sentences: Klein resonances have been proposed using the mass couplings of such resonances with the top quark. However, until the Large Hadron Collider (LHC) reaches full operational power, observation of such resonances are unlikely.