Complex sentence: When Rawls is promoted to Deputy Commissioner, he is put in charge of the weekly ComStat meetings during which he often berates and chastises his Majors when they make mistakes or are unable to control crime rate in their respective jurisdictions.
Split into simpler sentences: When Rawls is promoted to Deputy Commissioner, he is put in charge of the weekly ComStat meetings. During these meetings, he often berates and chastises his Majors when they make mistakes or are unable to control crime rate in their respective jurisdictions.