It is entirely reasonable for auditors to believe that scientists who know exactly where they are going and how they will get there should not be distracted by the necessity of keeping one eye on the cash register while the other eye is on the microscope.
本句的主体结构是it is adj. for sb. to do …., believe后面是that引导的宾语从句。从句中scientists是主语，后面是who know exactly where they are going and how they will get there定语从句修饰，谓语动词是被动语态should not be distracted by，the necessity是宾语，of keeping one eye on the cash register while the other eye is on the microscope引导结构做定语。
entirely reasonable 完全有理由
cash register 收银机
The coming of age of the postwar baby boom and an entry of women into the male-dominated job market have limited the opportunities of teenagers who are already questioning the heavy personal sacrifices involved in climbing Japan’s rigid social ladder to good schools and jobs.