Complex sentence: The award also severly limited her power over her own inheritance: she was forced to bequeath all of it to Thomas when she died; until then, Cecily was allowed to grant lands worth up to 1,000 marks per annum for a limited number of years.
Split into simpler sentences: The award also severly limited her power over her own inheritance: she was forced to bequeath all of it to Thomas when she died. Until then, Cecily was allowed to grant lands worth up to 1,000 marks per annum for a limited number of years.