a. Yi Sun-shin was one of the greatest admirals, who made the Turtle Ship.
b. Yi Sun-shin, who made the Turtle Ship, was one of the greatest admirals.
Are they both correct and natural?
Both are unnatural (outside of context, at least), and only (b) is correct. Is there a reason you are making "made the Turtle Ship" a subordinate piece of information? Why not use an appositive? There are two options for appositives, depending on what you want to make the main point of the sentence:
c. Yi Sun-shin, one of the greatest admirals, made the Turtle Ship. d. Yi Sun-shin, designer of the Turtle Ship, was one of the greatest admirals.
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