Complex sentence: Doron and her friend attempted to document how it was being polluted, as well as, the community's thoughts on the subject, but the only people who cooperated with the teens were drunks roaming the banks of the river.
Split into simpler sentences: Doron and her friend attempted to document how it was being polluted, as well as, the community's thoughts on the subject. However, The only people who cooperated with the teens were drunks roaming the banks of the river.