Complex sentence: Early competitors included TelSurf Networks, BeVocal, Hey Anita and Quack.com, which was founded in 1999 and acquired in September, 2000 by America Online to power its competing service AOL By Phone.
Split into simpler sentences: Early competitors included TelSurf Networks, BeVocal, Hey Anita and Quack.com. Quack.com was founded in 1999 and acquired in September, 2000 by America Online to power its competing service, AOL By Phone.