Simplify the following text for a Grade 7 native English-speaking person.
Original: The non-program content of Debian began to comply with the DFSG more strictly in Debian 4.0 ( released in April 2007 ) and subsequent releases .
Simplified: The non-software content of Debian began to follow the DFSG more strictly in Debian 4.0 ( released in April 2007 ) and following releases .