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"that is which" is not a grammatically correct phrase in written English.
It combines two relative pronouns, "that" and "which", which serve similar functions in a sentence. It would be more appropriate to use one or the other, depending on the context. For example, if you want to specify a particular item among a group, you can use "that." Such as, "I want to buy the dress that is on sale." In this case, "that" is used to specify a single item from a group of dresses. On the other hand, if you want to provide additional information or clarification about something, you can use "which." For instance, "The book, which was published last year, has already won several awards." In this sentence, "which" is used to provide extra information about the book. To make the phrase "that is which" grammatically correct, you can use it in the following context: "The event was a success, thanks to the efforts of the organizers, that is which must be commended." Here, "that" is referring to the efforts of the organizers and "which" is providing clarification that they should be commended for their efforts. However, it would be.
Exact(60)
Real to me, that is — which in rock and roll is the only fantasy that counts.
If you're scared of clowns that is – which, let's face it, you are.
Jones says this will raise Melco's operating margin (Ebitda, that is), which has been 11%, to 20% in 2010.
Each iteration of the waterfilling algorithm has a cost that is which means that we can solve (31) very fast.
Self-initiated change that is, which lies at the heart of new year's resolutions.
G3 is a "strategic advisory consultancy," (whatever that is), which has fingers in a wide and delicious selection of pies.
G3 is a "strategic advisory consultancy" (whatever that is), which has fingers in a wide and delicious selection of pies.
It is just as likely that making her VP will liberate her from her husband's agenda (whatever that is), which undercut her candidacy in the primaries.
We introduced JC7-1 aspecificific RBIP marker that is which appears suitable enough to differentiate certain Mexican and Guatemalan accessions from others.
Make sure your throne is at a level that is which both feet are touching the ground.
Dead celebrities, that is, which means their heirs and estates.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com