Complex sentence: Minimum pay rates are defined by UK Government minimum wage regulations, and both BECTU and Equity have agreed rates with each body, but even on non-union productions extra's pay is an agreed day-rate for ten hours of production time.
Split into simpler sentences: Minimum pay rates are defined by UK Government minimum wage regulations, and both BECTU and Equity have agreed rates with each body. However, even on non-union productions an extra's pay is an agreed day-rate for ten hours of production time.