Complex sentence: The main hub of the London Polish community is Hammersmith in west London, Ealing, Balham, Enfield, Willesden Green, Streatham, Haringey, Stratford, Wood Green, and High Street Kensington.
Split into simpler sentences: The main hub of the London Polish community is Hammersmith in west London. Elsewhere in London there are Polish communities in Ealing, Balham, Enfield, Willesden Green, Streatham, Haringey, Stratford, Wood Green, and High Street Kensington.