Revelation 21:3

I’ll be going over Rev 21:1-7 in my Greek class on Thursday, and I’ve found a syntactically confusing passage I’d appreciate your thoughts on. The sentence is the fifth clause of Rev 21:3, which reads as follows: καὶ αὐτὸς ὁ θεὸς μετ᾽ αὐτῶν ἔσται [αὐτῶν θεός], KAI AUTOS hO QEOS MET’ AUTWN ESTAI [AUTWN QEOS]. […]