Areas where there are open grasslands and crop fields and where grain spillage results in high mouse populations are especially suitable for nesting barn owls.
(grain spillage; results; in high mouse populations) (Areas where there are open grasslands and crop fields and where grain spillage results in high mouse populations; are; especially suitable for nesting barn owls)
grain spillage Areas where there are open grasslands and crop fields and where grain spillage results in high mouse populations
results are
in high mouse populations
especially suitable for nesting barn owls