Complex sentence: He is best remembered today for his manuscript (which was probably originally a private letter) called "A Discourse of Ireland", which was apparently written in 1620, and was first published in 1904.
Split into simpler sentences: He is best remembered today for his manuscript (which was probably originally a private letter) called "A Discourse of Ireland". Yhe Discourse was apparently written in 1620, and was first published in 1904.