The primary reasons for the decimation of wild animal populations are human overpopulation and other activities that result in the destruction and fragmentation of habitat.
(The primary reasons for the decimation of wild animal populations; are; human overpopulation and other activities) (other activities; result; in the destruction and fragmentation of habitat)
The primary reasons for the decimation of wild animal populations other activities
are result
human overpopulation and other activities
in the destruction and fragmentation of habitat