Complex sentence: They released only one album in the 1960s, the now cult Os Ipanemas, released in 1964, a mix of Bossanova, Brazilian samba, African rhythms and Jazz.
Split into simpler sentences: They released only one album in the 1960s, which has achieved cult status, Os Ipanemas. It was released in 1964 and features a mix of Bossanova, Brazilian samba, African rhythms and Jazz.