Original: His henchman, Kurwenal, answers more brusquely, saying that Isolde is in no position to command Tristan and reminds Brangäne that Isolde’s previous fiancé, Morold, was killed by Tristan.
Simplified: His henchman, Kurwenal, speaks crossly to Brangaene, reminding her that Isolde’s previous fiancé, Morold, had been killed by Tristan and his head sent back to Ireland.