The football star visited the school and he explained how much he values his education then he encouraged the students to stay in school and told them to set strict goals for themselves.

Choose the best correction for the run-on sentence.

The football star visited the school. And he explained how much he values his education. Then he encouraged the students. To stay in school and set strict goals for themselves.
The football star visited the school. He explained how much he values his education, and then he encouraged the students to stay in school. And told them to set strict goals for themselves.
The football star visited the school, and he explained how much he values his education. Then he encouraged the students to stay in school. He told them to set strict goals for themselves.
The football star visited. The school and he explained how much he values his education. He encouraged the students to stay in school and told them to set strict goals for themselves.

Answer: The football star visited the school, and he explained how much he values his education. Then he encouraged the students to stay in school. He told them to set strict goals for themselves.

Explanation:

The answer is this because some of the other options had sentences starting with "and", and others had incomplete clauses, so this is the correct answer.

Answer Link