Original: Ollard, 1984, ch .16 The detailed private diary he kept during 1660 - 1669 was first published in the nineteenth century, and is one of the most important primary sources for the English Restoration period.
Simplified: The detailed private diary that he kept during 1660 - 1669 was first published in the nineteenth century, and is one of the most important primary sources for the English Restoration period.