Complex sentence: Aside from being harmful to Clark Kent, the mineral produces bizarre changes in flora and fauna, including occasionally bestowing metahuman abilities on humans depending on the circumstances of their exposure to it, such as a girl treated for a rare bone disease acquiring shapeshifting powers.
Split into simpler sentences: Aside from being harmful to Clark Kent, the mineral produces bizarre changes in flora and fauna. It also occasionally bestows metahuman abilities on humans depending on the circumstances of their exposure to it, such as a girl treated for a rare bone disease acquiring shapeshifting powers.