Complex sentence: The Scottish version of modernism, and often known as the Scottish literary renaissance was begun by Hugh MacDiarmid in the 1920s when he abandoned his English language poetry and began to write in Lallans.
Split into simpler sentences: The Scottish version of literary modernism is often known as the Scottish literary renaissance. It was begun by Hugh MacDiarmid in the 1920s when he abandoned his English language poetry and began to write in Lallans.