Learn French: Ce qui plaît aux gens, c'est de voir plusieurs sketchs. - What pleases people is to see several sketches.

We use ce qui because it is the subject of the verb plaît. In these emphasis structures, use ce qui for the subject (the thing doing the action) and ce que for the object (the thing receiving the action).

Why is it aux gens rather than just les gens?

The verb plaire (to please) is always followed by the preposition à to indicate who is being pleased. Because gens is plural, à and les contract to form aux.

Why is there a de in c'est de voir?

When c'est introduces an infinitive verb that defines the first half of the sentence, you must add de before the infinitive. It links the idea of what pleases people directly to the action of seeing (voir).

Is sketchs a typo for the English word sketches?

No! When French borrows English words ending in a consonant, it typically forms the plural just by adding a standard French s at the end, resulting in sketchs.