Simplify the following text for a Grade 13 native English-speaking person.
Original: Some Actinobacteria form branching filaments , which somewhat resemble the mycelia of the unrelated fungi , among which they were originally classified under the older name Actinomycetes .
Simplified: Some form branching filaments , which somewhat resemble the mycelia of the unrelated fungi , among which they were originally classified as the Actinomycetes .