Complex sentence: Los Abuelos played in García's 1982 Christmas concert, and García drafted López, Melingo and Calamaro for his band, in parallel with their work for the "Abuelos".
Split into simpler sentences: Los Abuelos played in García's 1982 Christmas concert. García also drafted López, Melingo and Calamaro for his band, in parallel with their work for the "Abuelos".