Simplify the following text for a Grade 10 native English-speaking person.
Original: After Gladys Davis became Cayce 's secretary on September 10 , 1923 , all readings were preserved and his wife Gertrude Evans Cayce generally conducted ( guided ) the readings .
Simplified: Gladys Davis , his assistant , recorded the readings and his wife , Gertrude Evans Cayce , guided him during hypnosis .