In plain words
For those attached to enjoyment and power, whose minds are carried away by such teachings, resolute buddhi does not arise in the inner mind.
Word for word
For those attached to enjoyment and lordship, whose minds are carried off by that [speech], resolute buddhi is not established in samādhi [the inner organ].
The commentators
Bhagavadgītābhāṣyam
तेषां च —
भोगैश्वर्यप्रसक्तानां भोगः कर्तव्यः ऐश्वर्यं च इति भोगैश्वर्ययोरेव प्रणयवतां तदात्मभूतानाम् । तया क्रियाविशेषबहुलया वाचा अपहृतचेतसाम् आच्छादितविवेकप्रज्ञानां व्यवसायात्मिका साङ्ख्ये योगे वा बुद्धिः समाधौ समाधीयते अस्मिन् पुरुषोपभोगाय सर्वमिति समाधिः अन्तःकरणं बुद्धिः तस्मिन् समाधौ, न विधीयते न भवति इत्यर्थः ॥ ४४ ॥
In plain words
And as for people like this —
'Attached to enjoyment and lordship' simply describes people who live by this conviction: enjoyment must be pursued, and power and prosperity too — devoted to nothing else, they've made these two things their whole identity. Swept along by that speech, thick with its rites, their minds are carried away, their power to discriminate covered over completely. And so the resolved understanding — the one that belongs to Sāṅkhya or to Yoga — never becomes fixed in their samādhi. Here Śaṅkara means something precise by samādhi: it is simply that in which the thought 'everything exists for my enjoyment' has settled and taken root — that is, the inner instrument, the mind itself. And in a mind like that, the resolved understanding simply does not take hold. That is the sense of it.
Close to the Sanskrit
And of them —
'Of those attached to enjoyment and lordship' [means]: 'enjoyment is to be pursued, and lordship too' — thus, of those devoted precisely to enjoyment and lordship [alone], whose very self has become that. By that speech, abounding in specific rites, whose minds are carried away, whose discriminative wisdom is covered over — the resolved understanding, whether concerning Sāṅkhya or Yoga, is [not established] in samādhi. In this — [the notion] 'everything is for the enjoyment of the person' — is deposited; thus [it is called] samādhi, [that is] the inner organ, the intellect. In that samādhi, [the resolved understanding] is not established, does not occur. Such is the meaning.