In plain words
The Rudras, Adityas, Vasus, Sadhyas, Vishvedevas, Ashvins, Maruts, ancestors, gandharvas, yakshas, asuras, and siddhas all gaze upon You in wonder.
Word for word
The Rudras and Ādityas, the Vasus and those who [are] the Sādhyas, the Viśvedevas, the two Aśvins, the Maruts and the Ūṣmapas, and the hosts of gandharvas, yakṣas, asuras and siddhas gaze at You, all of them amazed.
The commentators
Bhagavadgītābhāṣyam
किञ्चान्यत् —
रुद्रादित्याः वसवो ये च साध्याः रुद्रादयः गणाः विश्वेदेवाः अश्विनौ च देवौ मरुतश्च ऊष्मपाश्च पितरः, गन्धर्वयक्षासुरसिद्धसङ्घाः गन्धर्वाः हाहाहूहूप्रभृतयः यक्षाः कुबेरप्रभृतयः असुराः विरोचनप्रभृतयः सिद्धाः कपिलादयः तेषां सङ्घाः गन्धर्वयक्षासुरसिद्धसङ्घाः, ते वीक्षन्ते पश्यन्ति त्वां विस्मिताः विस्मयमापन्नाः सन्तः ते एव सर्वे ॥ २२ ॥
In plain words
And there is something further —
The Rudras, the Ādityas, the Vasus, the Sādhyas — every troop of them; the Viśvedevas, the twin Aśvins, the Maruts, the ancestral spirits who feed on the offering's steam; the Gandharvas — Hāhā and Hūhū among them — the Yakṣas led by Kubera, the Asuras led by Virocana, the perfected sages led by Kapila — every single one of them, all these gathered hosts, stare at you in utter astonishment. All of them, without exception.
Close to the Sanskrit
And what else —
The Rudras, the Ādityas, the Vasus, and the Sādhyas — the Rudra-group, that is the troops — the Viśvedevas, the two Aśvins and gods, the Maruts, and the Ūṣmapas, that is the ancestors; the multitudes of Gandharvas, Yakṣas, Asuras, and Siddhas — Gandharvas: Hāhā, Hūhū, and the rest; Yakṣas: Kubera and the rest; Asuras: Virocana and the rest; Siddhas: Kapila and the rest; their multitudes — the multitudes of Gandharvas, Yakṣas, Asuras, and Siddhas — they gaze upon, see, you, astonished, having fallen into wonder, being so; they indeed, all of them.