Simplify the following text for a Grade 11 native English-speaking person.
Original: The early Germanic tribes spoke mutually intelligible dialects , and shared a common culture and mythology ( see Germanic mythology ) , as is indicated by Beowulf and the Volsunga saga .
Simplified: However , as for mythology only the Scandinavian one ( see Germanic mythology ) is sufficiently known . Some traces of common traditions between various tribes are indicated by Beowulf and the Volsunga saga .