Complex sentence: The First National Bank of Athens FDIC 2114/1866 arrived in Europe from the USA and was merged with a small British private bank to form the Gunners Bishop Bank of Athens that operated as a British bank in the City of London (Fenchurch Street, London EC3).
Split into simpler sentences: The First National Bank of Athens FDIC 2114/1866 arrived in Europe from the USA and was merged with a small British private bank to form the Gunners Bishop Bank of Athens. This bank operated as a British bank in the City of London (Fenchurch Street, London EC3).