Simplify the following text for a Grade 7 native English-speaking person.
Original: On the night of June the 6th he tried to steal food from Zachariah Clark , the `` house of the colony 's assistant commissary for stores '' , and was caught by a convict named William Saltmarsh .
Simplified: On June 6 he tried to steal food from Zachariah Clark , who was the assistant in charge of the new colony 's food supplies . Caesar was caught by a convict named William Saltmarsh .