The field of medicine has not traditionally distinguished between someone who is merely "not ill" and someone who is in excellent health and pays attention to the body’s special needs.

主干：The field has not distinguished (between...and...)

主句的謂語用了distinguished between...and...的結構，and連接的兩個someone都用了who引導的定語從句予以修飾。

譯文：傳統上，醫學并沒有區分一個僅僅是“沒有生病”的人和一個健康狀況很好并且注意自己身體特殊需要的人。這兩種類型都被稱作“健康”。