Complex sentence: In 1999, Eugene Goland co-founded Russia's premiere web-based portal, Mail.ru which grew to 15 Million users and became the first company in the segment to secure venture capital funding.
Split into simpler sentences: In 1999, Eugene Goland co-founded Russia's premiere web-based portal, Mail.ru, which grew to 15 Million users. It became the first company in the segment to secure venture capital funding.