Complex sentence: During Ragnarök, Vidar was slain in battle with trolls, who had invaded his lands at Loki's command; when Thor found Vidar's body, he had Vidar's farms set ablaze to serve as his funeral pyre.
Split into simpler sentences: During Ragnarök, Vidar was slain in battle with trolls, who had invaded his lands at Loki's command. When Thor found Vidar's body, he had Vidar's farms set ablaze to serve as his funeral pyre.