Complex sentence: In April 2015, Amazon Watch AmazonWatch released videos sent from a whistleblower inside Chevron showing employees and consultants finding petroleum contamination at sites in the Ecuadorean Amazon that the company claimed was cleaned up years earlier.
Split into simpler sentences: In April 2015, Amazon Watch AmazonWatch released videos reportedly sent from a whistleblower inside Chevron. The videos purportedly show employees and consultants finding petroleum contamination at sites in the Ecuadorean Amazon that the company claimed was cleaned up years earlier.