Complex sentence: He lives in Port Lincoln, South Australia where he manages his business interests in fishing and aquaculture, most notably Southern bluefin tuna (Thunnus maccoyii) fishing and offshore ranching in Spencer Gulf for export markets.
Split into simpler sentences: He lives in Port Lincoln, South Australia where he manages his business interests in fishing and aquaculture. His interests include Southern bluefin tuna (Thunnus maccoyii) fishing and offshore ranching in Spencer Gulf for export markets.