Complex sentence: Doctors advised Alonso to not race as it could cause further damage, and the team announced that his place would be taken by reserve driver Kevin Magnussen, who achieved a second place finish at the event in 2014.
Split into simpler sentences: Doctors advised Alonso to not race as it could cause further damage. He will therefore be replaced by reserve driver Kevin Magnussen, who achieved a second place finish at the event in 2014.