Complex sentence: Of his three children Kazimierz (Togo) (1904-1981) continued to paint in watercolour; some works having been looted under occupation very occasionally reappear in sales-rooms.
Split into simpler sentences: Of his three children Kazimierz (Togo) (1904-1981) continued to paint in watercolour. Some works, having been looted under occupation, very occasionally reappear in sales-rooms.