uncle arrives tomorrow she wants to see him This sentence is a run on sentence?

Yes, the sentence "Uncle arrives tomorrow she wants to see him" is a run-on sentence.

Here's why:

* Two independent clauses: It contains two separate ideas that could stand alone as sentences:

* "Uncle arrives tomorrow."

* "She wants to see him."

* Lack of proper connection: The two clauses are not properly connected with a conjunction (like "and," "but," "or"), a semicolon, or a colon.

Here are some ways to fix it:

* Add a conjunction: "Uncle arrives tomorrow, and she wants to see him."

* Use a semicolon: "Uncle arrives tomorrow; she wants to see him."

* Make it two separate sentences: "Uncle arrives tomorrow. She wants to see him."