Complex sentence: Early stages of mastitis can present with local pain, redness, swelling, and warmth, later stages also present with systemic symptoms like fever and flu-like symptoms and in rare cases an abscess can develop.
Split into simpler sentences: Early stages of mastitis can present with local pain, redness, swelling, and warmth. Later stages also present with systemic symptoms like fever and flu-like symptoms and in rare cases an abscess can develop.