Simplify the following text for a Grade 10 native English-speaking person.
Original: The impact associated with the crater is implicated in causing the extinction of the dinosaurs as suggested by the Kâ `` T boundary , the geological boundary between the Cretaceous and Tertiary periods , although some critics argue that the impact was not the sole reason and others debate whether there was a single impact or whether the Chicxulub impactor was one of several that may have struck the Earth at around the same time .
Simplified: The impact associated with the crater is implicated in causing the extinction of the dinosaurs .