 The "moderate biennium " and the governments of the Liberal Union (1856-1863) General O'Donnell played a leading role in the Vicalvarada that started the Progressive Biennium and was the architect of the governments of the Liberal Union.
<fluency>  The "moderate biennium " and the governments of the Liberal Union (1856-1863) General O'Donnell played a leading role in the Vicalvarada that started the Progressive Biennium and was the architect of the governments of the Liberal Union.
 The moderate biennium and the governments of the Liberal Union (1856-1863) General O'Donnell played a leading role in the Vicalvarada that started the Progressive Biennium and was the architect of the governments of the Liberal Union.