Complex sentence: Its "Americana" section--containing items clipped from newspapers and other magazines nationwide--became a much-imitated feature, and Mencken further spiced the package with aphorisms printed in the magazine's margins whenever space allowed.
Split into simpler sentences: Its "Americana" section--containing items clipped from newspapers and other magazines nationwide--became a much-imitated feature. Mencken spiced the package with aphorisms printed in the magazine's margins whenever space allowed.