Complex sentence: Scout returns to the boat unharmed, and together with Ian the cat, she and Eric, now reconciled, swim to a "conceptual island" which resembles the Greek island on which Clio and the first Eric holidayed before she died.
Split into simpler sentences: Scout returns to the boat unharmed, and together with Ian the cat. She and Eric, now reconciled, swim to a "conceptual island" which resembles the Greek island on which Clio and the first Eric holidayed before she died.