Simplify the following text for a Grade 9 native English-speaking person.
Original: During the second era ( 7th â `` 9th editions , 1827 â `` 1901 ) , the Britannica was managed by the Edinburgh publishing firm , A & C Black .
Simplified: In the second era ( 7th â `` 9th editions , 1827 â `` 1901 ) , the Britannica was owned by the Edinburgh company , A & C Black .