Original sentence: The Large Hadron Collider (LHC) at CERN in Geneva, which came online on September 10, 2008 is scheduled to become fully operational by late 2009, and is expected to provide experimental evidence either confirming or refuting the Higgs boson's existence
Edited sentence: The Large Hadron Collider (LHC) at CERN in Geneva, which briefly came online on September 10, 2008 and was scheduled to become fully operational by late 2009 (now postponed due to several problems) is expected to provide experimental evidence either confirming or refuting the Higgs boson's existence