en_tn/dan/08/22.md

As for the horn that was broken ... four others arose

"Where the large horn was broken off, four others arose"

but not with his great power

"but not with the great power that the king represented by the long horn had"

shall have reached their limit

"have reached their full" or "have run their course"

grim-faced

This means someone who looks defiant, or like he will refuse to obey.