Complex sentence: All notion of early Mexican California blended many ethnic cultures while business productivity was possible for all and yet the largest financial estate in 1850's California was unable to be retained by the Leidesdorff family.
Split into simpler sentences: All notion of early Mexican California blended many ethnic cultures. Business productivity was possible for all and the largest financial estate in 1850's California was unable to be retained by the Leidesdorff family.