Complex sentence: Although Atari itself rarely published games for 8-bit computers many other companies did, because of graphics superior to that of the Apple II and Atari's home-oriented marketing, and the Atari 8-bit computers gained a good reputation for games.
Split into simpler sentences: Although Atari itself rarely published games for 8-bit computers many other companies did. Because of graphics superior to that of the Apple II and Atari's home-oriented marketing, the Atari 8-bit computers gained a good reputation for games.