Complex sentence: In 1825, the Ceylonese had a knowledge of coffee production, since Sri Lanka had become a British colony., the first coffee plantation was started in Baddegama, Galle District as a planted garden crop.
Split into simpler sentences: In 1825, the Ceylonese had a knowledge of coffee production, as Sri Lanka had become a British colony. The first recorded coffee plantation of that time was in Baddegama, Galle District, as a planted garden crop.