Sentence:  Theorem 3.2.3. "A periodic Abelian group is the <WSD>direct product</WSD> of its Sylow subgroups, S(p)." 
Meaning of the word marked with <WSD> tags:  Such a set of tuples formed from two or more groups, forming another group whose group operation is the component-wise application of the original group operations and of which the original groups are normal subgroups.