Complex sentence: In 1586 the Flemish mathematician Simon Stevin published a small pamphlet called "De Thiende" ("the tenth") in which he declared that using decimals was so important that the universal introduction of decimal weights, measures and coinage was only a matter of time.
Split into simpler sentences: In 1586 the Flemish mathematician Simon Stevin published a small pamphlet called "De Thiende" ("the tenth"). Stevin declared that using decimals was so important that the universal introduction of decimal weights, measures and coinage was only a matter of time.