Without a principled individuation condition for Sinn, the sense/reference distinction cannot do the explanatory work Frege assigns it in solving the informativeness puzzle of identity statements.

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Frege(as a major historical figure in philosophy): Gottlob Frege (1848-1925) was a German logician and philosopher who founded modern logic and did groundbreaking work on how language relates to meaning and existence.
Sense/reference distinction(as the philosophical distinction being invoked): Frege's famous theory that words have two separate aspects: their 'sense' (the concept or meaning in your head) and their 'reference' (the actual object in the world they point to).
individuation condition(needed to make the sense/reference distinction work properly): A rule or principle that tells us how to count or identify when two things are the same or different—like how to tell when two meanings are actually the same meaning.
informativeness puzzle of identity statements(the philosophical problem being solved): The puzzle of why saying 'The Morning Star is the Evening Star' seems informative (teaches us something new) even though both names refer to the same planet; Frege's theory tries to explain this.
sinn(Fregean philosophy of language and propositional composition): Frege's German term, usually translated as 'sense'; refers to meanings or concepts that serve as the constituents of propositions on the Fregean view.

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