Complex sentence: The younger sister of Martinez, Jr., is named Rosa, which is also the name of his wife, Rosa Ancira Martinez, whom he married in 1959 and has six children, Leticia, Adriana, Mercurio, III, Jorge, Carlos, and Rosalycia.
Split into simpler sentences: The younger sister of Martinez, Jr., is named Rosa, which is also the name of his wife, Rosa Ancira Martinez, whom he married in 1959. Mercurio and Rosa Martinez have six children, Leticia, Adriana, Mercurio, III, Jorge, Carlos, and Rosalycia.