Complex sentence: The first ever home grown UK'acid lab' that got busted was in 1969--up to then all LSD had been imported from the U.S., or was remnant produce of Sandoz before it stopped producing LSD.
Split into simpler sentences: The first ever home grown UK'acid lab' was busted in 1969. Up to then, all LSD had been imported from the U.S. or was remnant produce of Sandoz before it stopped producing LSD.