Original: Most heteromyids live in complex burrows within the deserts and grasslands of western North America, though species within the Heteromys and Liomys genera are also found in forests and extend down as far as northern South America.
Simplified: Most heteromyids live in complex burrows in the deserts and grasslands of western North America. Some species within the Heteromys and Liomys genera are also found in forests and can be found down as far as northern South America.