Xīn rèn huìzhǎng shàngrèn hòu zuò le hěn duō gǎigé.
The new president made many reforms after taking office.
Tips
usage
会长 is for associations/clubs. 总统 (zǒngtǒng) is for a country's president. 校长 (xiàozhǎng) is for a school principal. 董事长 (dǒngshìzhǎng) is for a company chairman.