Synonyms:

yatatah–while endeavoring; hi–certainly; api–in spite of; kaunteya–O son of Kunti; purusasya–of the man; vipascitah–full of discriminating knowledge; indriyani–the senses; pramathini–stimulated; haranti–throws forcefully; prasabham–by force; manah–the mind.

Translation:

The senses are so strong and impetuous, O Arjuna, that they forcibly carry away the mind even of a man of discrimination who is endeavoring to control them.