Complex sentence: The absence of an appropriate crane at the jetty made loading "Turmoil" with dispersant at Port Bonython impossible, so the tugboat proceeded to Whyalla to load, while the dispersant was transported by road.
Split into simpler sentences: The absence of an appropriate crane at the jetty made loading "Turmoil" with dispersant at Port Bonython impossible. Instead, the tugboat proceeded to Whyalla to load, while the dispersant was transported there by road.