Simplify the following text for a Grade 7 native English-speaking person.
Original: Otto Frank began working at the Opekta Works , a company that sold fruit extract pectin , and found an apartment on the Merwedeplein ( Merwede Square ) in Amsterdam .
Simplified: Opteka was a company that sold pectin . Otto Frank found an apartment on the Merwedeplein ( Merwede Square ) in Amsterdam .