In this sentence, the writer is using six words to express a meaning where one word w

[nelson13]

In this sentence, the writer is using six words to express a meaning where one word will do.

In this sentence, the meaning is understandable, but I doubt whether WHERE can be used in this way.

WHERE as a relative pronoun can replace IN/ON/AT/TO WHICH, but in the sentence above it seems that none fits.

[Rover_KE]

It can also mean 'for which'.

[charliedeut]

In this sentence, the writer is using six words to express a meaning where one word will do.

In this sentence, the meaning is understandable, but I doubt whether WHERE can be used in this way.

WHERE as a relative pronoun can replace IN/ON/AT/TO WHICH, but in the sentence above it seems that none fits.

There is your "in". In this sentence, where one word will (or would) do to express a meaning, the writer is using six words.

As you see, I have changed the order of the words in the sentence. Hope it is clearer now.