Complex sentence: It's also the first to feature free 3G wireless through AT&T to access the Sony eBookstore without the need of a computer, and to increase the grayscale level, from 8 to 16.
Split into simpler sentences: It's also the first to feature free 3G wireless through AT&T to access the Sony eBookstore without the need of a computer. It also is the first to increase the grayscale level, from 8 to 16.