Complex sentence: The seed of ordinary lettuce, "Lactuca sativa", is still used in Avicenna's native Iran as a folk medicine, and a crude extract of the seeds was shown to have analgesic and anti-inflammatory effects in standard formalin and carrageenan tests of laboratory rats.
Split into simpler sentences: The seed of ordinary lettuce, "Lactuca sativa", is still used in Avicenna's native Iran as a folk medicine. A crude extract of the seeds was shown to have analgesic and anti-inflammatory effects in standard formalin and carrageenan tests of laboratory rats.