Complex sentence: The Texans failed after one year and was sold back to the NFL, who folded the Texans franchise, and its remains were awarded to an ownership group in Baltimore to form the second version of the Baltimore Colts.
Split into simpler sentences: The Texans failed after one year and were sold back to the NFL, who folded the Texans franchise. Its remains were awarded to an ownership group in Baltimore to form the Baltimore Colts.