Original sentence: At the time of the sinking, the Patria was carrying around 1,800  Jewish refugees from Nazi-occupied Europe who were being deported by the British to Mauritius and Trinidad because they did not possess entry visas (whose issuance had been restricted after the publication of the White Paper of 1939) for  Mandate Palestine
Edited sentence: At the time of the sinking, the Patria was carrying around 1,800  Jewish refugees from Nazi-occupied Europe who were being deported by the British to Mauritius and Trinidad because they did not possess entry permits