Original: Leonardo would have been exposed to a vast range of technical skills and had the opportunity to learn drafting, chemistry, metallurgy, metal working, plaster casting, leather working, mechanics and carpentry as well as the artistic skills of drawing, painting, sculpting and modelling.
Simplified: While he was at the workshop, he was able to learn all sorts of other useful skills: chemistry, metallurgy, metal working, plaster casting, leather working, mechanics and carpentry.