@Secrets_NeverSeen Of course.
First, you should add either 'a' or 'the' before lunar eclipse, 'the' if it's a specific known event, 'a' if it could be any lunar eclipse. Add 'the' before whole realm. And a girl will 'be' born.
Also, (this is entirely optional) if you want to make the second sentence more direct, say, "She'll help unite the different realms and bring peace to the war which has been ongoing for centuries."
If you want, you can add 'and' between 'the choices she makes' and 'the path she follows', but you don't have to. It just depends on what flow you prefer. And to make the last bit more concise, you can phrase it, "of whole realms for she is the chosen one." It'll just cut out unnecessary words so it doesn't seem like a run-on sentence.
Hope that helped.