The writer tries to be fancy. For example "ourlé" is a sewing term. I've never heard "maître maison" (master house?) but I'm guessing it could be translated like this (I've changed the order of the word to make it flow better in English: The institute offers its master houses to masters (very important people) and open its ravishing sanctuary with fountains around its edges.

My interpretation: The institute (the establishment) proposes (introduces / offers) (to you) its “home trained” masters and opens its ravishing (wonderful) sanctuary bordered with fountains to the experts in the field.

Trop pompeux pour être honnête...

The institute have their own "home-masters" and open its wonderful sanctuary within you can see fountains... Mais cette phrase en français est trop peu claire, et un peu pompeuse à mon goût

Salut Ella ! I think it may mean : The institute proposes its Masters "home-made", and opens his charming sanctuary furnished by fountains, "of which spout of" celebrities of this kind. ourlé = hemmed, sommité = celebrities of one field (medecine or architecture....) something-maison or fait maison = home-made