Complex sentence: He was again a vital part of Iran's U19's participating at the 2010 AFC U- 19 Championship, he played in Iran's first two games, Iran losing both and failing to qualify from its group.
Split into simpler sentences: He was again a vital part of Iran's U19's participation at the 2010 AFC U- 19 Championship. He played in Iran's first two games, Iran losing both and failing to qualify from its group.