Complex sentence: During pre-commissioning exercises off Darwin in August 2006 her sewerage system malfunctioned, resulting in four sailors being gassed with hydrogen sulphide and possibly carbon monoxide, resulting in at least one of them being hospitalised for several weeks.
Split into simpler sentences: During pre-commissioning exercises off Darwin in August 2006 her sewerage system malfunctioned, and four sailors were gassed with hydrogen sulphide and possibly carbon monoxide. This led to at least one of them being hospitalised for several weeks.