Simplify the following text for a Grade 12 native English-speaking person.
Original: Full scale development of the IMSAI 8080 was begun , and by October 1975 an advertisement was placed in the magazine Popular Electronics , receiving positive reactions .
Simplified: Full scale development of the IMSAI 8080 was put into action , and by October 1975 an ad was placed in Popular Electronics , receiving positive reactions .