Breakdown of Le grenier dans lequel vous installez les étagères est sombre.
être
to be
vous
you (plural/formal)
dans
in, inside
sombre
dark
Questions & Answers about Le grenier dans lequel vous installez les étagères est sombre.
Why do we use "dans lequel" here instead of just "que"?
How do I know whether to use "lequel", "laquelle", or a plural form here?
Since this is a physical place, could I use "où" instead?
Why is the verb "est" (is) all the way at the end of the sentence?
The main subject of the sentence is Le grenier (The attic) and its verb is est. The entire middle section, dans lequel vous installez les étagères, is a relative clause providing extra information to describe the attic. If you remove it, the core sentence is simply Le grenier est sombre (The attic is dark).