Complex sentence: However, even natural occurrences, such as droughts and tidal changes, can often strand manatees in an unsuitable habitat, and some are killed accidentally by fishing trawls and nets intended for catching sharks.
Split into simpler sentences: However, even natural occurrences, such as droughts and tidal changes, can often strand manatees in unsuitable habitats. Some are killed accidentally by fishing trawls and nets intended for catching sharks.