Rig Veda 1.158.6

Sanskrit text [Accents, Plain, Transliterated]:

दी॒र्घत॑मा मामते॒यो जु॑जु॒र्वान्द॑श॒मे यु॒गे । अ॒पामर्थं॑ य॒तीनां॑ ब्र॒ह्मा भ॑वति॒ सार॑थिः ॥
दीर्घतमा मामतेयो जुजुर्वान्दशमे युगे । अपामर्थं यतीनां ब्रह्मा भवति सारथिः ॥
dīrghatamā māmateyo jujurvān daśame yuge | apām arthaṃ yatīnām brahmā bhavati sārathiḥ ||

English translation:

“Dīrghatamas, the son of Mamatā, has grown old after the tenth yuga (has passed); he is the Brahmā of those who seek to obtain the object of their (pious) works; he is their charioteer.”

Commentary by Sāyaṇa: Ṛgveda-bhāṣya

He is the Brahmā: apām artham yatīnām brahmā bhavati sārathiḥ: he is the Brahmā, like Brahma (brahmā brahmāsadṛśaḥ parivṛḍhaḥ bhavati), the great, the chief;

Parivṛḍha = the progenitor,or creator of people. apām = apkāryāṇām, of those by whom offerings of water, obsequial libations to the manes are to be made; or, apām = apasam, of works, religious rites in genitive ral;

Sāratiḥ = lit. a charioteer; i.e. a conveyer, to heaven, a deity

Details:

Ṛṣi (sage/seer): dīrghatamā aucathyaḥ [dīrghatamas aucathya];
Devatā (deity/subject-matter): aśvinau ;
Chandas (meter): nicrṛdanuṣṭup ;
Svara (tone/note): Swar;

Padapatha [Accents, Plain, Transliterated]:

दी॒र्घऽत॑माः । मा॒म॒ते॒यः । जु॒जु॒र्वान् । द॒श॒मे । यु॒गे । अ॒पाम् । अर्थ॑म् । य॒तीना॑म् । ब्र॒ह्मा । भ॒व॒ति॒ । सार॑थिः ॥
दीर्घतमाः । मामतेयः । जुजुर्वान् । दशमे । युगे । अपाम् । अर्थम् । यतीनाम् । ब्रह्मा । भवति । सारथिः ॥
dīrgha-tamāḥ | māmateyaḥ | jujurvān | daśame | yuge | apām | artham | yatīnām | brahmā | bhavati | sārathiḥ

Multi-layer Annotation of the Ṛgveda

[Rigveda 1.158.6 English analysis of grammar]