Complex sentence: Peer review was designed because of economic scarcity: a limited number of pages in a print source, so peer review help publishers ensure that the limited resources are reserved for the most relevant or very best material (Fitzpatrick 128).
Split into simpler sentences: Peer review was designed because of economic scarcity: a limited number of pages in a print source. Thus, peer review helps publishers to ensure that the limited resources are reserved for the most relevant or very best material (Fitzpatrick 128).