Complex sentence: The song "Sad Times, Bad Times" was considered a reference at the time to the infamous South African Treason Trial in Pretoria, which had begun in 1956 and lasted for more than four years before it collapsed with all the accused acquitted.
Split into simpler sentences: The song "Sad Times, Bad Times" was a reference at the time to the infamous South African Treason Trial in Pretoria. The trial lasted for more than four years before it collapsed with all the accused acquitted.