Complex sentence: He would spend much of his time at the estate when he was in Bangladesh, formed a collection of statues there by local artist Asaduzzaman Khan, and of plants from around the world, particularly medicinal and fruit-bearing trees.
Split into simpler sentences: He would spend much of his time at the estate when he was in Bangladesh. He formed a collection of statues there by local artist Asaduzzaman Khan and another of plants from around the world, particularly medicinal and fruit-bearing trees.