Complex sentence: Rice does not affect the flavour of beer to any appreciable extent, and is generally used to lighten the body and the mouthfeel, sweeten the flavour, and increase alcohol content.
Split into simpler sentences: Rice does not affect the flavour of beer to any appreciable extent, and is generally used to lighten the body and the mouthfeel. Rice is used to sweeten the flavour, lighten the body, and increase alcohol content.