Complex sentence: In December 2013, Tetzchner founded the company Vivaldi Technologies and launched the online community site vivaldi.net, which includes a forum, blogs, chat, photo sharing and a free email service named Vivaldi Mail.
Split into simpler sentences: In December 2013, Tetzchner founded the company Vivaldi Technologies and launched the online community site vivaldi.net. Vivaldi.net includes a forum, blogs, chat, photo sharing and a free email service named Vivaldi Mail.