Packaging can actually prevent certain kinds of waste.

Literal

Packaging [by-means-of-によって] actually certain-kind [possessive-の] waste [object-を] prevent [able-to-ことが出来る]

によって here means 'by means of' (not marking a passive agent). ある種の = 'a certain kind of' (ある + 種). ~ことが出来る is the formal potential — more bookish than the verb's potential form alone.