Complex sentence: Giambattista della Porta is said to have perfected camera obscura described it as having a convex lens in later edition of his Magia Naturalis (1558-1589), the popularity of which helped spread knowledge of it.
Split into simpler sentences: Giambattista della Porta is said to have perfected camera obscura. He described it as having a convex lens in later editions of his Magia Naturalis (1558-1589), the popularity of which helped spread knowledge of it.