This creature, which has spread to areas throughout North America, can carry a bacterium which causes the disease.
(This creature; has spread; to areas throughout North America) (This creature, which has spread to areas throughout North America; can carry; a bacterium which causes the disease) (a bacterium; causes; the disease)
This creature This creature, which has spread to areas throughout North America a bacterium
has spread can carry causes
to areas throughout North America
a bacterium which causes the disease
the disease