Complex sentence: He was a son of the Count Władysław Gurowski, an ardent admirer of Tadeusz Kościuszko and lost the greater part of his estates through having participated in the November Uprising of 1830.
Split into simpler sentences: He was a son of the Count Władysław Gurowski, an ardent admirer of Tadeusz Kościuszko. Adam lost the greater part of his estates through having participated in the November Uprising of 1830.