本句的大结构是一个宾语从句,主句为Barnes suggests,从句为that you assume your date is picking up the check if he asks you out,then chooses a restaurant without consulting you,and orders an expensive entree and a bottle of wine to match,while you're modest in your meal selection.
从句部分整个是一个条件状从句,主句为that you assume your date is picking up the check,从句为if he asks you out,then chooses a restaurant without consulting you,and orders an expensive entree and a bottle of wine to match,while you're modest in your meal selection.
条件状语从句的从句部分又是一个时间状语从句,主句为if he asks you out,then chooses a restaurant without consulting you,and orders an expensive entree and a bottle of wine to match,从句为while you're modest in your meal selection.