Complex sentence: They also discover and rescue Zissou's nemesis, Alistair Hennessey, who is is successful, suave, and rich, and was once married to Zissou's wife Eleanor.
Split into simpler sentences: They also discover and rescue Zissou's nemesis, Alistair Hennessey. Hennessey is successful, suave, and rich, and was once married to Zissou's wife Eleanor.