During the period generally designated as Koine Greek, a great deal of phonological change occurred: at the start of the period, the pronunciation was virtually identical to Ancient Greek phonology, whereas in the end it had much more in common with Modern Greek phonology.
A great deal of phonological change occurred. This was during the period. This period was generally designated as Koine Greek. The pronunciation was virtually identical to Ancient Greek phonology. This was at the start of the period. It had much more in common with Modern Greek phonology. This was in the end.