Original sentence: The church's youth groups and Greek school which was led by Despina Haralambidou, Helen Exarhos, and George Marouchos continued the high level of activity they had reached under Father Palassis
Edited sentence: The church's youth groups and Greek school which was led by Despina Haralambidou, Helen Exarhos (who also previously served as church secretary at the older location in the 1960s), and George Marouchos continued the high level of activity they had reached under Father Palassis