Complex sentence: First registered in 1965 and marketed by Dow Chemical under the tradenames Dursban, Lorsban and Renoban, chlorpyrifos was a well known home and garden insecticide, and at one time it was one of the most widely used household pesticides in the US.
Split into simpler sentences: First registered in 1965 and marketed by Dow Chemical Company under the tradenames Dursban, Lorsban and Renoban. Chlorpyrifos was a well known home and garden insecticide, and at one time it was one of the most widely used household pesticides in the US.