Complex sentence: As anti-captivity protests began to put pressure on aquaria, Sealand agreed to release Haida, but the animal died a few days before the scheduled release in October 1982, with no evidence of foul play to be found.
Split into simpler sentences: As anti-captivity protests began to put pressure on aquaria, Sealand agreed to release Haida. Haida unfortunately died a few days before the scheduled release in October 1982, with no evidence of foul play to be found.