I forgot to include the following sentences.
1) Other themes are (those of?) the passing of time and the relationship with nature.
2) Beowulf swang up (the same as "raised"?) his towering shield and shook out (the same as "lifted") his sword so hard that it snapped against the dragon's head.
3) He dies from the dragon's poisonous bit.Beowulf describes and aristocratic and military society, both heathen and heroic (?)
4)
1 - including "those of" makes it wordy
2 - delete "swang up" and use "raised" - delete "shook out" and use "lifted"
3 - He dies from the dragon's poisonous bite. Beowulf describes an aristocratic and military society, both heathen and heroic. compare carefully