Object has got too much vertiges

[Loveboy]

Hi Guys, an object has got too much vetiges and i must separating.
here two picture:



You see a big object..



Now you see there are mini details so get a error.

My error is: To many Vertiges: 7749 > 5450. Try separating the object into multiple objects.

I must now make it to half but idk how i can make it, so that the error didn't come anymore.
If i make the object to half, i must make new images?

Thank you for your help!