Complex sentence: After a year, he succeeds in tracking down the band, and after being briefly tortured by the lawless gang in Túrin's absence, is set free and is able to deliver to Túrin the message of the king's pardon.
Split into simpler sentences: After a year, he succeeds in tracking down the band, and is taken prisoner by them in Turin's absence. When Beleg recovers, he is able to deliver to Túrin the message of the king's pardon.