Simplify the following text for a Grade 9 native English-speaking person.
Original: Originally , a vendetta was a blood feud between two families where kinsmen of the victim intended to avenge his or her death by killing either those responsible for the killing or some of their relatives .
Simplified: Originally , a vendetta was a blood feud between two families . Kinsmen of the victim wanted to take revenge for his or her death by killing either those responsible for the killing or some of their relatives .