Complex sentence: The popularity of G-Shocks increased rapidly throughout the 1990s, and by 1998,19 million G-Shocks had been sold worldwide and there seemed to be a peak in demand as over 200 new models were released in that year alone.
Split into simpler sentences: The popularity of G-Shocks increased rapidly throughout the 1990s. By 1998,19 million G-Shocks had been sold worldwide and there seemed to be a peak in demand as over 200 new models were released in that year alone.