Simplify the following text for a Grade 9 native English-speaking person.
Original: This creature 's eating habits can be modeled with a Markov chain since its choice depends on what it ate yesterday , not additionally on what it ate 2 or 3 ( or 4 , etc. ) days ago .
Simplified: This creature 's eating habits can be modeled with a Markov chain since its choice depends on what it ate yesterday , not additionally on what it ate 2 or 3 ( or 4 , etc. . . )