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". So, we place dashes before and after this non - essential clause.

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.