Complex sentence: The rash caused by ACA is most evident on the extremities or limbs beginning with an inflammatory stage with bluish red discoloration and cutaneous swelling and concluding several months or years later with an atrophic phase.
Split into simpler sentences: The rash caused by ACA is most evident on the extremities or limbs. It begins with an inflammatory stage with bluish red discoloration and cutaneous swelling, and concludes several months or years later with an atrophic phase.