Complex sentence: He was no longer asked to speak publicly, and his isolation increased because was fired from the "Nederlandsche Omroep" after he went into hiding after Dolle Dinsdag, when rumors of liberation by the Allies spread.
Split into simpler sentences: He was no longer asked to speak publicly, and his isolation increased after he was fired from the "Nederlandsche Omroep". He went into hiding after Dolle Dinsdag, when rumors of liberation by the Allies spread.