Complex sentence: Paintings and decorations in those "kofun" indicate the spread of Taoism and Buddhism in this period; the Takamatsuzuka Kofun and Kitora Kofun are notable for their wall paintings.
Split into simpler sentences: Paintings and decorations of those "kofun" indicate the spread of Taoism and Buddhism in this period. The Takamatsuzuka Kofun and Kitora Kofun are the most famous for their wall paintings.