Complex sentence: In mathematics, in the area of abstract algebra known as group theory, an A-group is a finite group with the property that all of its Sylow subgroups are abelian.
Split into simpler sentences: In mathematics, in the area of abstract algebra known as group theory, an A-group is a type of group that is similar to abelian groups. An A-group is a finite group with the property that all of its Sylow subgroups are abelian.