I’m stuck on a English question and need an explanation. Hi here is the question; Watch part of the documentary "BBC's the Story of Ireland Part 5: The Story of Nations" and read W. B. Yeats's "Easter 1916". How do you read Yeats's line "a terrible beaut

 I’m stuck on a English question and need an explanation.

Hi here is the question; Watch part of the documentary "BBC's the Story of Ireland Part 5: The Story of Nations" and read W. B. Yeats's "Easter 1916". How do you read Yeats's line "a terrible beauty is born"? I need it simple words and around 200 words.