Complex sentence: Reforms in the 1990s allowed foreign ownership and resulted in reopening of mines and increased mining; according to the Secretaría de Economía, 204 mining companies with direct foreign investment had 310 ongoing projects in Mexico in 2006.
Split into simpler sentences: Reforms in the 1990s allowed foreign ownership, and resulted in reopening of mines and increased mining. According to the Secretaría de Economía, 204 mining companies with direct foreign investment had 310 ongoing projects in Mexico in 2006.