Complex sentence: Diana is one of two side-scan sonar systems on board Nautilus, is used to create maps of the seafloor and to identify targets of interest that ROVs Hercules and Argus investigate in more detail.
Split into simpler sentences: Diana is one of two side-scan sonar systems on board Nautilus. It is used to create maps of the seafloor and to identify targets of interest that ROVs Hercules and Argus investigate in more detail.