Complex sentence: Sosa was arrested in Mexico City along with two of his brothers Horacio and Ignacio Sosa, and Marcelino Coache, the four had traveled to Mexico's capital to speak out against government repression in the Mexican state of Oaxaca.
Split into simpler sentences: Sosa was arrested in Mexico City along with two of his brothers Horacio and Ignacio Sosa, and Marcelino Coache. The four had traveled to Mexico's capital to speak out against government repression in the Mexican state of Oaxaca.