this figure is much higher than that of other colleges whose average employment rate of journalism graduates is only 66 percent.
问题描述：
this figure is much higher than that of other colleges whose average employment rate of journalism graduates is only 66 percent.
答
这个数字比其他院校都要高，其他院校的平均就业率只有66%
答
this figure is much higher than 【that】 of other colleges
其中that在意思上就是前面的 figure,
原句也就是：this figure is much higher than 【the figure】 of other colleges
这个数据比其他学院的（数据）要高得多
随后,句子又加上由whose引导的定语从句,其先行词是other colleges
也就是other colleges' average employment rate of journalism graduates is only 66 percent.（其他学院的新闻学毕业生的平均就业率仅有66%）
全句翻译：这个数据比其他学院的（数据）要高得多,别的学院的新闻学毕业生的平均就业率只有66%.