Complex sentence: In April, 1865, she began, in partnership with Henry Byron, the management of the Prince of Wales's Theatre, having secured as a leading actor Squire Bancroft, whom she had met shortly before in Liverpool.
Split into simpler sentences: In April, 1865, she began, in partnership with Henry Byron, the management of the Prince of Wales's Theatre. She secured as a leading actor Squire Bancroft, whom she had met shortly before in Liverpool.