Complex sentence: Various types of cover material, such as ash, sawdust, soil, sand, dried leaves, lime, compost can be added to the faeces chamber of a UDDT to reduce odour and to speed up the drying process.
Split into simpler sentences: Various types of cover material, such as ash, sawdust, soil, sand, dried leaves, lime, compost can be added to the faeces chamber of a UDDT. Addition of one or more of these materials acts to reduce odour and to speed up the drying process.