... It has been the home to dozens of A-list movie actors and Broadway stars, though its acting programme at the New School, founded in 1994, had never been considered ... to be one of the nation's top drama programmes.
A comma is useful for breaking up related ideas in a sentence. The phrase 'founded in 1994' provides additional information (how long the school has been in existence).
Put commas in these sentences:
Sam the eldest child was the only one who had the chance to attend university.
The football team which came third in last year's tournament was the winner this year.
People flocked to see the film which recently won an Oscar over the weekend.
Answer: 1. , the eldest child, 2. , which came third in last year's tournament, 3. , which recently won an Oscar,