Complex sentence: In addition, the Carnival Spirit has recently been dry docked in San Francisco to prepare it for Australia and this has included a new thrill slide called green thunder as well as, an outdoor bbq, a new serenity deck, and regular renovations.
Split into simpler sentences: In addition, the Carnival Spirit is currently in San Francisco for dry dock to prepare it for Australia. It is getting a new thrill slide called green thunder, an outdoor bbq, a new serenity deck, and regular renovations.