Simplify the following text for a Grade 9 native English-speaking person.
Original: Felix Dassel , who was treated at the hospital and knew Anastasia , recalled that the grand duchess had a `` laugh like a squirrel , '' and walked rapidly `` as though she tripped along . ''
Simplified: Felix Dassel , who was treated at the hospital , remembered that Anastasia had a `` laugh like a squirrel '' , and walked quickly `` as though she tripped along . ''