Complex sentence: Kája Saudek and Miloš Macourek began their collaboration in the early 1960s, as filmmakers, then decided to work on a cycle of graphic novels; the first installment of the cycle, "Muriel a andělé" (Muriel and Angels), was announced in 1969.
Split into simpler sentences: Kája Saudek and Miloš Macourek began their collaboration in the early 1960s. The publishing of the first part of the cycle, "Muriel a andělé" (Muriel and Angels), was announced in 1969.