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The ancient Greeks are known to have been great watchers of the sky and also great thinkers. Complex Subject.

As they watched the sky night after night, it was natural for them to think that the Earth stood and the stars, planets, sun and moon were moving round the earth in space. For-to-infinitive construction.

They thought the sun to be between Venus and Mars. Complex Object.

To explain the movement of the planets, however, was very difficult.

Then one day a young scientist named Copernicus at Krakow University in Poland supposed that the sun and not the Earth should be the centre of everything.

He was the first to explain properly our solar system. Complex Subject.

The ancient Greeks had made the mistake of thinking that because the stars and planets seemed to move as they looked at the sky, the Earth must stand. Complex Subject.

If you sat in a train and looked out at the trees, it would be easy to understand their mistake.

The trees seem to be moving backwards, but really it is the train that is moving forwards. Complex Subject.