Complex sentence: From 1777 to 1791, Vermont was an independent country, often referred to in the present day as the Vermont Republic, although during that time it was usually called the state of Vermont or the commonwealth of Vermont.
Split into simpler sentences: From 1777 to 1791, Vermont was an independent country, often referred to in the present day as the Vermont Republic. During that time it was usually called the state of Vermont but sometimes called the Commonwealth of Vermont or the Republic of Vermont.