Complex sentence: His brother, Wallace Lupino (1898-1961) was also an actor, as was Wallace's son, Richard Lane; and their niece, Ida Lupino (daughter of actor Stanley Lane), the most famous member of this Anglo-Italian acting family.
Split into simpler sentences: His brother, Wallace Lupino (1898-1961) was an actor, as was Wallace's son, Richard Lane. Henry and Wallace Lupino's niece, Ida Lupino, the daughter of actors Stanley Lane (1893-1942) and Connie Emerald (1892-1959), was the most famous member of this Anglo-Italian acting family.