Complex sentence: The islands of the Forth are the group of islands that lie in the Firth of Forth and the estuary of the River Forth, located on the east coast of Scotland, between the Lothians and Fife.
Split into simpler sentences: The islands of the Forth are the islands located in the Firth of Forth and the estuary of the River Forth. They lie on the east coast of Scotland, between the Lothians and Fife.