Complex sentence: He started playing with Ricardo Palma founder ot Los Rockets, 1963 and then co-founded Los Juniors, with Emilio Ortega, in 1965, both of them considered among the top guitar players of the Nicaragua rock movement in the 60's.
Split into simpler sentences: He started playing with Ricardo Palma founder of Los Rockets, in 1963 and then co-founded Los Juniors, with Emilio Ortega, in 1965. Both were among the top guitar players of the Nicaragua rock movement in the 60's.