Learn French: Le sculpteur a sculpté ce marbre avec passion. - The sculptor sculpted this marble with passion.

To use the perfect participle, we need to turn this completed action into a clause that happens before a main event. You could say: Ayant sculpté ce marbre avec passion, il l'a vendu à un bon prix (Having sculpted this marble with passion, he sold it at a good price). We use ayant rather than étant because the verb sculpter takes the auxiliary verb avoir.

Is the letter 'p' pronounced in sculpteur and sculpté?

No, the 'p' is completely silent! Unlike in English, words in this French family (sculpter, sculpteur, sculpture) are pronounced as if the 'p' wasn't there at all (sounding more like 'scul-teur' or 'scul-té'). This is a very common pronunciation trap.

Marble is a material. Why can we say ce marbre (this marble) as if it's a countable object?

While marbre is generally an uncountable noun for the material, in art contexts it becomes countable. Un marbre refers specifically to a distinct block of marble meant for carving, or to the finished marble statue itself.

Sculpting takes a long time. Why use the passé composé (a sculpté) instead of the imparfait?