sentence: Many now think that the construction began at around 229-330 A.D. If the Patlachique and Tzacualli phases are now this late, the chronology of Teotihuacán will require some crucial changes.
modified: fix grammar: Many now thinking that the construction began at around 229-330 A.D. If the Patlachique and Tzacualli phases are now this late, the chronology of Teotihuacán require some crucial changes.