Complex sentence: On February 2010, the major cartels aligned in two factions, one made up of the Juárez Cartel, Tijuana Cartel, Los Zetas and the Beltrán-Leyva Cartel; the other faction made up of the Gulf Cartel, Sinaloa Cartel and La Familia Michoacana.
Split into simpler sentences: On February 2010, the major cartels aligned in two factions. The other faction was made up of the Gulf Cartel, Sinaloa Cartel, and La Familia Michoacana.