Simplify the following text for a Grade 5 native English-speaking person.
Original: The main active ingredient of beer is alcohol , and therefore , the health effects of alcohol apply to beer .
Simplified: Normal beers have around 4-6 % alcohol ( for the volume , i.e. in 100ml beer there is 4-6ml alcohol ) . In brewing beer , the amount of alcohol can be made more or less quite easily .