Complex sentence: In the past, Saphan Khwai is one of the farming sites at the northern outskirt of Bangkok downtown, next to the northern part of Phaya Thai field, irrigated with Khlong Sam Sen and Khlong Bang Sue linking from the Chao Phraya River.
Split into simpler sentences: In the past, Saphan Khwai was one of the farming sites on the northern outskirts of Bangkok's core, next to the northern part of Phaya Thai field. It was irrigated by Khlong Sam Sen and Khlong Bang Sue, diverted from the Chao Phraya River.