Important water-quality issues in the YRB generally are related to effects of land and water management practices, but some are related to natural factors.
(Important water-quality issues in the YRB; generally are related; to effects of land and water management practices) (some; are; related to natural factors) (some; related; to natural factors)
Important water-quality issues in the YRB some some
generally are related are related
to effects of land and water management practices
related to natural factors
to natural factors