Complex sentence: In 1919 it acquired "Fisons", a business founded by James Fison of Thetford in 1808: the Company formally changed its name to "Fisons Ltd" in 1942.
Split into simpler sentences: In 1919 it acquired "Fisons", a business founded by James Fison of Thetford in 1808, from which it subsequently took its name. The Company formally changed its name to "Fisons Ltd" in 1942.