Original sentence: Both have been anticipated for over 30 years.Of the discoveries the LHC might make, the possibility of the discovery of the supersysmmetric partners and the Higgs particle are the most keenly awaited by physicists, although neither of these can be considered  certainties
Edited sentence: Of the discoveries the LHC might make, the possibility of the discovery of the supersysmmetric partners and the Higgs particle have been keenly awaited by physicists for over 30 years, although neither of these can be considered  certainties