Complex sentence: Such chapels can be found in many large, European Roman Catholic churches, usually dedicated to one individual saint, they were often patronised by a member of the nobility who had purchased a vault beneath to be a family mausoleum.
Split into simpler sentences: Such chapels can be found in many large, European Roman Catholic churches. Usually dedicated to one individual saint, they were often patronised by a member of the nobility who had purchased a vault beneath as a family mausoleum.