Kjell Lindgren is a NASA astronaut. He is replacing items inside the ISS.

Kjell Lindgren, who is replacing items inside the ISS, is a NASA astronaut.

Kjell Lindgren, whom is replacing items inside the ISS, is a NASA astronaut.

Kjell Lindgren, which is replacing items inside the ISS, is a NASA astronaut.

Kjell Lindgren, whose is replacing items inside the ISS, is a NASA astronaut.