Complex sentence: Since the Second World War the Chianina has become a world breed, raised almost exclusively for its high quality meat, and has through exportation of breeding stock, frozen semen, and embryos, reached China, Russia, Asian countries and the Americas.
Split into simpler sentences: Since the Second World War the Chianina has become a world breed, raised almost exclusively for its high quality meat. Through exportation of breeding stock, of frozen semen and of embryos, it has reached China, Russia, Asian countries and the Americas.