Complex sentence: Isaac Newton's famous and influential book Philosophiæ Naturalis Principia Mathematica was written in Latin; and even into the 20th century some philosophical works had Latin titles, including Russell and Whitehead's Principia Mathematic, and Ludwig Wittgenstein's Tractatus Logico-Philosophicus.
Split into simpler sentences: Isaac Newton's famous and influential book Philosophiæ Naturalis Principia Mathematica was written in Latin. And even into the 20th century some philosophical works had Latin titles including Russell and Whitehead's Principia Mathematic and Ludwig Wittgenstein's Tractatus Logico-Philosophicus.