3 Then another sign appeared in heaven: an enormous red dragon with seven heads and ten horns and seven crowns on its heads.

Read Revelation 12:3 Using Other Translations

And there appeared another wonder in heaven; and behold a great red dragon, having seven heads and ten horns, and seven crowns upon his heads.
And another sign appeared in heaven: behold, a great red dragon, with seven heads and ten horns, and on his heads seven diadems.
Then I witnessed in heaven another significant event. I saw a large red dragon with seven heads and ten horns, with seven crowns on his heads.