Complex sentence: These are obligate myrmecophiles which have undergone radical changes in body form, including segmental fusions within the abdomen and antennae to form strong rigid plate-and club-like structures respectively.
Split into simpler sentences: These are obligate myrmecophiles which have undergone radical changes in body form. These changes include segmental fusions in the abdomen and antennae to form strong plate-and club-like structures respectively.