Complex sentence: Kolélas was arrested in September 1963, spending one month in detention, and again in February 1964; on the latter occasion he was freed at the request of Prime Minister Pascal Lissouba.
Split into simpler sentences: Kolélas was arrested in September 1963 and spent one month in detention. He was arrested again in February 1964; on that occasion he was freed at the request of Prime Minister Pascal Lissouba.