How to split a GRID-block on 2 block indented?

I want to build a Grid:

It turned out only half the job. I want to separate the lower unit in half, don't know how.

Example here:
March 23rd 20 at 19:20
2 answers
March 23rd 20 at 19:22

even so, you can:
March 23rd 20 at 19:24
That's literally just sketched grid gallery for another question. In this case you should either use a subgrid, which is not yet supported by browsers, or just use one grid for the whole mesh. The ability grid is truly boundless.

Your case:

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