Question: What former top scoring striker for Watford F.C. was sold in January 2008 to another team?
Sentence (from "2007–08 Watford F.C. season"): However, after the departure of Adam Johnson to Middlesbrough on 11 November 2007 Watford's form declined; they won six of their next sixteen Championship games, and only one of their final sixteen.
Relevant evidence: No