Complex sentence: Cythna's father, Walter Edward Letty had many career changes and the family often moved and as a result Cythna attended a total of 13 schools, ending at the Pretoria Girls' High School.
Split into simpler sentences: Cythna's father, Walter Edward Letty, had many career changes and the family were often uprooted. As a result Cythna attended a total of 13 schools, ending at the Pretoria Girls' High School.