Complex sentence: Rita and Chico take their leave from the rest of their party and go to a bar where Chico introduces her to bebop music, which she takes up very quickly; afterwards they go to Chico's place and spend the rest of the night together.
Split into simpler sentences: Rita and Chico leave the rest of the party and go to a bar where Chico introduces her to bebop music, which she takes up quickly. Afterwards they go to Chico's place and spend the rest of the night together.