Complex sentence: In 1352 he fought in Toscana for the Visconti and, in 1354, he had to flee from Verona due to his support to Fregnano della Scala's failed coup against Cangrande II della Scala.
Split into simpler sentences: In 1352 he fought in Toscana for the Visconti. In 1354 he had to flee from Verona due to his support to Fregnano della Scala's failed coup against Cangrande II della Scala.