Complex sentence: Paleoparasitology (or "palaeoparasitology") is the study of parasites from the past, and their interactions with hosts and vectors; it is a subfield of Paleontology, the study of living organisms from the past.
Split into simpler sentences: Paleoparasitology (or "palaeoparasitology") is the study of parasites from the past, and their interactions with hosts and vectors. It is a subfield of Paleontology, the study of living organisms from the past.