Complex sentence: Prosopographical research has the aim of learning about patterns of relationships and activities through the study of collective biography, and proceeds by collecting and analysing statistically relevant quantities of biographical data about a well-defined group of individuals.
Split into simpler sentences: Prosopographical research has the aim of learning about patterns of relationships and activities through the study of collective biography. Such research proceeds by collecting and analysing statistically relevant quantities of biographical data about a well-defined group of individuals.