Simplify the following text for a Grade 12 native English-speaking person.
Original: He returned to academia , as Professor of Irish at University College Dublin , where one of his students was future Attorney-General and President of Ireland , Cearbhall Ã `` DÃ laigh .
Simplified: He became Professor of Irish at University College Dublin , where one of his students was future Attorney-General and President of Ireland , Cearbhall Ã `` DÃ laigh .