Complex sentence: Alternative toilet blocks may release pleasant odor, but also support cleaning and disinfecting of toilet bowls and urinals, in contrast to para-dichlorobenzene, which does not have cleaning or disinfecting properties.
Split into simpler sentences: Alternative toilet blocks may release pleasant odour, but also support cleaning and disinfecting of toilet bowls and urinals. To the contrary, para-dichlorobenzene does not have cleaning or disinfecting properties.