Aprepositional phrase can function in a sentence as an 1.adverb phrase? or 2 a noun phrase?

How to combine the two sentences in bold.

The caption is an example of which kind of bias? "cute baby boars snuffle for food in the undergrowth"

Which of the following is a complex sentence? a. after henry submitted his essay, he realized that he hadn't proofread the last page. b. identity theft is a growing problem, especially among seniors. c. we didn't have enough potatoes for dinner, so we served rice instead. d. jim tried to watch a video on a device connected to a crowded wireless network; as a result, the video stuttered and froze.