The cartridge is {HEAD ~ a drum cartridge} that has an electrophotographic photosensitive drum and is detachably mountable to {TAIL ~ the apparatus main body} 
is detachably mountable to
The cartridge is { HEAD ~ a drum cartridge } that has an electrophotographic photosensitive drum and is detachably mountable to { TAIL ~ the apparatus main body }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL