Question

insert two dashes where needed.
tim samaras the legendary storm chaser killed by a deadly tornado in 2013 was known for his daring missions to collect data from passing storms.

Explanation:

Dashes are used to set off non - essential information. Here, "the legendary storm chaser killed by a deadly tornado in 2013" is non - essential information about Tim Samaras.

Answer:

Tim Samaras—the legendary storm chaser killed by a deadly tornado in 2013—was known for his daring missions to collect data from passing storms.