Complex sentence: According to Edwin H. Land, it was discovered in 1852 by William Herapath, a doctor in Bristol, a pupil of which found that adding iodine to the urine of a dog that had been fed quinine produced unusual green crystals.
Split into simpler sentences: According to Edwin H. Land, it was discovered in 1852 by William Herapath, a doctor in Bristol. One of his pupils found that adding iodine to the urine of a dog that had been fed quinine produced unusual green crystals.