Complex sentence: The bank changed its name to Bank Haolim Erez-Israel-Polania on 20 April 1937 and on 6 April 1945 to Palestine-British Bank.
Split into simpler sentences: The bank changed its name to Bank Haolim Erez-Israel-Polania on 20 April 1937. On 6 April 1945 the bank changed its name to Palestine-British Bank.