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”?

 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.