Task: Explanation
Input (English): The Promise (original title: "Das Versprechen") is a German documentary film directed by Marcus Vetter with Karin Steinberger. The film tells the crime story of the double murder of Derek and Nancy Haysom on 30 March 1985 in Lynchburg, Virginia. The film focuses on the two main protagonists Jens Söring, son of a German diplomat, and Elizabeth Haysom, the daughter of the murdered couple. Both were sentenced to life in prison. The film makes use of extensive original footage from press archives, as the two court cases were the first lawsuits to be broadcast nationwide on American television. In the film, these recordings from 1985 to 1990 are combined with scenes shot during the making of the film, including interviews with Jens Söring, witnesses, the investigators involved in the case, lawyers, prosecutors and journalists. In addition, extensive materials such as original crime scene photos and evidence, court transcripts, newspaper archives, love letters and diaries of the two main protagonists were evaluated in the film. Question: Which protagonist in the documentary film "The Promise" was convicted of two counts of first-degree murder? Answer: Jens Söring
Output (English):  The film focuses on the two main protagonists Jens Söring, son of a German diplomat, and Elizabeth Haysom, the daughter of the murdered couple.