①x05Core Benefits is the term given to benefits which all staff enjoy
given做term的后置定语表示被动关系.
x05the term (given to benefits)
而which引导定语从句
x05benefits (which all staff enjoy) 所有员工都可以享受的福利
这句话是说：
x05Core Benefits（核心福利项目）是用来指所有员工都可以享受的福利的一个术语.
②x05such as
x05receiving a discount of 25% on most items (except sales goods),
x05holiday,
x05sick pay
x05and pension.
举了4个例子.
x05比如：一是除销售商品以外享受其他消费的七五折；二是享有假期；三是病假津贴；四是有抚恤金.
③x05sick pay：病假津贴(雇员生病期间由雇主支付的)