Which sentenc is grammatically right?

I want to know which of these three sentences is grammatically right and most commonly used?

Actually a student game me this question, and now I am aking you. Please help me. Thank you.

1. The greater the expectation placed upon people, often children or students and employees, is, the better they perform.

2. The greater the expectation placed upon people is, often children or students and employees, the better they perform.

3. The greater the expectation placed upon people, often children or students and employees, the better they perform.