Complex sentence: In the archaeological works carried through the beginning of 20th century, the Cividade seemed to have a disorganized structure, but more recent data suggests instead an organization whose characteristics stem from older levels of occupation, which had been ignored during the first archaeological works.
Split into simpler sentences: In the archaeological works carried through the beginning of 20th century, the Cividade seemed to have an anarchical structure, but more recent data suggests something different. In fact, these denote a space organization with proper characteristics whose organization comes from older levels of occupation, ignored during the first archaeological works.