If there were one thing that I’ve ever wanted to achieve in my life, it would be to become at least half the person she is.

So I wrote this sentance but a lot of people say not to end with is. How can I rephrase it. Or is using is at the end of the sentance ok?

You are perfectly correct to end the sentence with is. You could say -- "at least half the person THAT she is" -- but it's not necessary.

The people who object to your wording may be confusing is, a verb, with a preposition like in.

Thanks so much :)

You're welcome.

To rephrase the sentence and avoid ending with "is," you could consider the following options:

1. If there were one thing I’ve ever wanted to achieve in my life, it would be to become at least half the person that she is.
2. If there were one thing I’ve ever wanted to achieve in my life, it would be to become at least half as amazing as she is.
3. If there were one thing I’ve ever wanted to achieve in my life, it would be to become at least half of the remarkable individual she is.

Using "is" at the end of a sentence is generally acceptable and grammatically correct. However, some people advocate for avoiding it, as it can occasionally sound less formal or have a less polished effect. Ultimately, the decision to use or avoid ending a sentence with "is" depends on your personal preference and the context in which you are writing.