"资格要求严的" can be translated into English as "having strict qualification requirements" or more concisely as "stringent in qualification requirements". Here are a couple of example sentences to illustrate the usage:
1、 This position is stringent in qualification requirements, demanding both extensive experience and specialized skills.
（这个职位资格要求严，既需要丰富的经验，又需要专业技能。）
2、 The application process for this scholarship is quite demanding, with strict qualification requirements that many applicants find challenging to meet.
（这个奖学金的申请过程相当严格，资格要求严，许多申请者都觉得难以满足。）