Complex sentence: Such double surnames were proposed in the book The Seven Daughters of Eve; and an actual case from England, with the family matriname "Phythian", is thoroughly demonstrated and discussed in a "feature" article which is available online.
Split into simpler sentences: Such double surnames were proposed in the book The Seven Daughters of Eve. In addition, an actual English example thereof, with the family matriname "Phythian", is helpfully demonstrated and discussed in a "feature" article which is available online.