Complex sentence: He finished first across the line in the St. Leger for the second successive year on Qatar Racing's filly Simple Verse, only to be demoted to second place following a stewards enquiry, for deemed interference with the second placed horse Bondi Beach.
Split into simpler sentences: He finished first across the line in the St. Leger for the second successive year on Qatar Racing's filly Simple Verse. A subsequent stewards' enquiry, saw Atzeni and Simple Verse demoted to second place for deemed interference with the second placed horse Bondi Beach.