Complex sentence: Chlorpyrifos, marketed by Dow as Dursban, is well known as a home and garden insecticide, and until 2000 it was one of the most widely used household pesticide in the US.
Split into simpler sentences: Chlorpyrifos, marketed by Dow as Dursban, is well known as a home and garden insecticide. Until 2000, it was one of the most widely used household pesticide in the US.