Simplify the following text for a Grade 21 native English-speaking person.
Original: In March 2010 , following extensive analysis of the available evidence covering 20 years ' worth of data spanning the fields of palaeontology , geochemistry , climate modelling , geophysics and sedimentology , 41 international experts from 33 institutions reviewed available evidence and concluded that the impact at Chicxulub triggered the mass extinctions during Kâ `` T boundary including those of dinosaurs .
Simplified: In March 2010 , following analysis of the available evidence covering 20 years ' worth of data in the fields of palaeontology , geochemistry , climate modelling , geophysics and sedimentology , 41 international experts from 33 institutions reviewed available evidence and concluded that the impact at Chicxulub triggered the mass extinctions during K-T boundary including those of dinosaurs .