Complex sentence: Finally, he integrated to the group of José Luis Bacigalupo, Alfredo Luis Guidali, Jorge Osvaldo Riopedre, Héctor Ugarte and Simón L. Ungar, with which formed the Study URBIS, specialized in architecture and planing.
Split into simpler sentences: Finally, he joined into the group of José Luis Bacigalupo, Alfredo Luis Guidali, Jorge Osvaldo Riopedre, Héctor Ugarte and Simón L. Ungar. They formed the Study URBIS, which specialized in architecture and planing.