Complex sentence: Because of the high settling capacity of the granules, the use of traditional settler is unnecessary and therefore the installation can be built very compact, needing only 20% of the surface area of conventional activated sludge systems.
Split into simpler sentences: Because of the high settling capacity of the granules, the use of a traditional settler is unnecessary. Therefore the installation can be built very compact, needing only 20% of the surface area of conventional activated sludge systems.