Complex sentence: Rowing Club colours on a blazer or cap are encouraged, as is the wearing of Boaters and Ladies skirt hems must be below the knee and are checked before entry by the Stewards' Officers.
Split into simpler sentences: Rowing Club colours on a blazer or cap are encouraged, as is the wearing of boaters. A lady's skirt hem must reach below the knee and is checked before entry by the Stewards' Officers.