Simplify the following text for a Grade 9 native English-speaking person.
Original: VÃ zina was signed to a contract for C$ 800 per season , and made his professional debut December 31 , 1910 against the Ottawa Senators .
Simplified: VÃ zina was signed to a contract for C$ 800 per season , and made his professional debut , 1910 , against the Ottawa Senators .