Complex sentence: They can normally be identified with a blue-colored dye in the bowl water as chemical toilets are usually used for short term periods and because of their high purchase prices, they are mostly rented rather than bought, often including servicing and cleaning.
Split into simpler sentences: They can normally be identified with a blue-colored dye in the bowl water. As chemical toilets are usually used for short term periods and because of their high purchase prices, they are mostly rented rather than bought, often including servicing and cleaning.