Sentence structure (adverb; modifying the verb)

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Could you let me know about structure of the sentence as follow:

Flourishing areas of the cultures were selected with a microscope, sections of agar with suitable hyphae drilled out and placed on slides.

Thank you

[Mister Micawber]

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Flourishing areas of the cultures -- Subject

were selected -- Verb

with a microscope,-- Adverb, modifying the verb

sections of agar with suitable hyphae drilled out and placed on slides -- Nonfinite clause used as a sentence adverbial.
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Native English teacher at Mister Micawber's

[27029450]

Thank for your answer Micawber
I wonder why there is no conj between the two clause and whether "were" has been omitted from the latter clause ?Could you please to talk more about "sentence adverbial"?
Thank you
Steven

[Mister Micawber]

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Conjunctions are not necessary with nonfinite clauses. Here are some other examples:

Standing on my head, I thought the Eiffel Tower looked like an iron ice cream cone.

Surrounded by enemies, he could do nothing but lay down his arms.

It is not necessary to constantly interrupt me.

All of these nonfinite clauses are in fact sentence adverbials-- adverbs which cannot easily be related to any one part of the sentence, but modify the whole main clause.

If there is anything missing from your sentence, it is being:

Flourishing areas of the cultures were selected with a microscope, sections of agar with suitable hyphae [being] drilled out and placed on slides.

Whether being is actually missing or not, I leave to the etymologists among us.
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Native English teacher at Mister Micawber's

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