Complex sentence: In 1973 it became the first wreck designated as dangerous under section 2 of the Protection of Wrecks Act 1973, and there is an exclusion zone around it monitored visually and by radar.
Split into simpler sentences: In 1973 it became the first wreck designated as dangerous under section 2 of the Protection of Wrecks Act 1973. There is an exclusion zone around it monitored visually and by radar.