Complex sentence: Timur's commitment to the arts is evident in the way he was ruthless with his enemies but merciful towards those with special artistic abilities, sparing the lives of artists, craftmen and architects so that he could bring them to improve and beautify his capital.
Split into simpler sentences: Timur's commitment to the arts is evident in the way he was ruthless with his enemies but merciful towards those with special artistic abilities. He spared the lives of artists, craftmen and architects so that he could bring them to improve and beautify his capital.