Complex sentence: Charilaos Trikoupis was a 19th century Greek prime minister, and suggested the idea of building a bridge between Rio and Antirrio; however, the endeavour was too expensive at the time, when Greece was trying to get a late foot into the Industrial Revolution.
Split into simpler sentences: Charilaos Trikoupis was a 19th-century Greek prime minister; he suggested the idea of building a bridge between Rio and Antirrio. The project was too expensive at the time, when Greece was trying to get a late start in the Industrial Revolution.