Simplify the following text for a Grade 13 native English-speaking person.
Original: Polyploidy is a mechanism that has caused many rapid speciation events in sympatry because offspring of , for example , tetraploid x diploid matings often result in triploid sterile progeny .
Simplified: Polyploidy has caused many rapid speciation events because offspring of , for example , tetraploid x diploid matings often result in triploid sterile progeny .