Complex sentence: In 2008 the contest was changed to the Discovery Education 3M Young Scientist Challenge, and students no longer have to be nominated and must submit a 1-2 minute video clip as their form of entry.
Split into simpler sentences: In 2008 the contest was changed to the Discovery Education 3M Young Scientist Challenge. Students no longer have to be nominated and must now submit a 1-2 minute video clip as their form of entry.