Complex sentence: Known at the time as AHEAD Tutorial and Review Center, the company has since branched out into different brands, namely, AHEAD Books and Things, AHEAD Professional Network, AHEAD Online, and AHEAD Interactive.
Split into simpler sentences: Known at the time as AHEAD Tutorial and Review Center, the company has since branched out into different brands. Besides AHEAD Tutorial and Review Center, these brands are AHEAD Books and Things, AHEAD Professional Network, AHEAD Online, and AHEAD Interactive.