Complex sentence: Citrinin was one of the many mycotoxins which were discovered by H. Raistrick and A.C. Hetherington in the 1930s and in 1941 H. Raistrick and G. Smith identified citrinin to have a broad antibacterial activity.
Split into simpler sentences: Citrinin was one of the many mycotoxins which were discovered by H. Raistrick and A.C. Hetherington in the 1930s. In 1941 H. Raistrick and G. Smith identified citrinin to have a broad antibacterial activity.