Complex sentence: Another approach to mass concrete structures that is becoming more widespread is the use of roller-compacted concrete, which uses much lower levels of cement and water than traditional concrete mixtures, and is generally not poured into place.
Split into simpler sentences: Another approach to mass concrete structures that is becoming more widespread is the use of Roller Compacted Concrete. Roller Compacted Concrete uses much lower levels of cement and water than traditional concrete mixtures, and is generally not poured into place.