Complex sentence: This brigade was to be part of the Liverpool City Police Force and became operational in 1836 (Note: London took another 24 years before it had the "London Fire Engine Establishment"-an insurance organisation).
Split into simpler sentences: This brigade was to be part of the Liverpool City Police Force and became operational in 1836. It is worth noting that London took another 24 years before it had the London Fire Engine Establishment (an insurance organisation).