Complex sentence: Móstoles became famous on May 2,1808, when, although it was only a small village, one of its two mayors, Andrés Torrejón, declared war on France, following the Dos de Mayo Uprising the same day in Madrid which started the Peninsular War.
Split into simpler sentences: Móstoles became famous on May 2,1808, when, although it was only a small village, one of its two mayors, Andrés Torrejón, declared war on France. This followed the Dos de Mayo Uprising the same day in Madrid which started the Peninsular War.