Complex sentence: This was beset by many problems (including the tragic drowning of Oboler's son in a water-filled excavation) and was never completed, although a Lautner-designed retreat for Oboler's wife was eventually built.
Split into simpler sentences: This was beset by many problems (including the tragic drowning of Oboler's son in a water-filled excavation). A Lautner-designed retreat for Oboler's wife was eventually built.