Complex sentence: By 1918, there were 36 brewing companies, but over the 20th century, the industry consolidated until today, only two corporations, Grupo Modelo and FEMSA control 90% of the Mexican beer market.
Split into simpler sentences: By 1918, there were thirty-six brewing companies, but over the 20th century, the industry consolidated until today. Only two corporations, Grupo Modelo and FEMSA control 90% of the Mexican beer market.