Existing Wording: In the second case, the contained extension is defined separately.

Proposed Wording: In the second case, the registrar field of the contained extension is defined separately.

Comment:

It seems to me that the first two fields of the extension (status and date) are not defined separately, but are defined identically to the first example. Only the last field (registrar) seems to be defined separately. If my interpretation is correct, the proposed wording clarifies what is "separately defined."