Complex sentence: Keeping in mind the fate of his own brother, Dmitry had Vasily blinded and exiled him to Uglich, in 1446; hence, Vasily's nickname,' the blind'("Tyomniy", literally' dark').
Split into simpler sentences: Keeping in mind the fate of his own brother, Dmitry had Vasily blinded and exiled him to Uglich (1446). Hence, Vasili's nickname' the blind'("Tyomniy", literally' dark').