Complex sentence: In 1926, after seeing the palaces of Europe, "Ras" Hailu Tekle Haymanot began to remodel the palace his father built at Debre Marqos in the image of what he had seen in Europe.
Split into simpler sentences: In 1926, after having seen the palaces of Europe, "Ras" Hailu Tekle Haymanot began to remodel the palace his father built at Debre Marqos. He did so in the image of what he had seen in Europe.