Complex sentence: At the end of 1148, Stephen and Theobald came to a temporary compromise that allowed Theobald to return to England, where he was appointed a papal legate in 1151, adding to his authority.
Split into simpler sentences: At the end of 1148, Stephen and Theobald came to a temporary compromise that allowed Theobald to return to England. Theobald was appointed a papal legate in 1151, adding to his authority.