Fix the run-on below by using punctuation and/or a conjunction:

The ice cream tastes great it is made in Vermont.

Since the two parts of this sentence are independent clauses, you can separate them using a semicolon.

The ice cream tastes great; it is made in Vermont.

You could also use a period, although this creates a choppier effect.

The ice cream tastes great. It is made in Vermont.

Either one is correct, however the first sentence flows more smoothly.

The ice cream tastes great, it is made in Vermont.

The ice cream tates great. It was made in Vermont.