Complex sentence: It can easily penetrate ordinary clothing and even rubber, on the skin there is immediate pain and itching with a rash and swelling, blisters develop after 12 hours and discomfort lasts for 2 to 3 days.
Split into simpler sentences: It can easily penetrate ordinary clothing and even rubber; upon skin contact it causes immediate pain and itching with a rash and swelling. Blisters develop after 12 hours, and discomfort lasts for 2 to 3 days.