This is from the Standard Course Book of HSK5, section 15.
What is the meaning of 去换回? I know that 去回 means to return or to go back and 换 to change or to exchange, but 去换回 really perplexes me.
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[派]赵括[去] = [sent] 赵括 [to]
[换回]廉颇 = [exchange] 廉颇 [back]
去(to go/ to) is acting as a preposition
回 [back] is the verb result particle of 换[exchange]. It indicates the result of the verb
派赵括[去] [换回]廉颇 = send 赵括 [to] [exchange] 廉颇 [back]
去 connects the two phrases 派出赵括 and 换回廉颇
派出赵括 (sent 赵括 out)
换回廉颇 (exchange 廉颇 back)
Once you gained an understanding of the context of this historical story, you should have no trouble understanding the meaning of "去换回".
赵王 was upset with 廉颇's refusal of confronting and fighting the intruding enemy directly, and tricked to believe the widely spread rumor; he fired 廉颇 and sent 赵括 to (去) replace (换下) him. After being replaced by 赵括, 廉颇 had to return (返回) to the kingdom to face the consequence of 抗拒皇命.
Under a prisoner exchange agreement, he was exchanged 换 and returned 回 to British soil.
Zhao Kuo replaced Lian Po.
Lian Po returned home.
An interesting and very violent story!
Qin, seeing that a quick victory was not possible,
then planned to sow discord,
by making King Zhao believe that they were very worried, very afraid that Zhao Kuo would replace Lian Po.
King Zhao, who was eager for victory,
finally fell for the (Qin) misinformation plan,
(and) believing Lian Po was afraid to fight,
relieved Lian Po of command,
(and) used Zhao Po as commanding general.
although Zhao Kuo's mother strongly remonstrated
pointing out that Zhao Kuo only knew theoretical military tactics and was not suitable to undertake this great task,
King Zhao wouldn't listen,
(and) assigned Zhao Kuo as commanding general.
After Zhao Kuo took Lian Po's position,
(he) completely changed Lian Po's strategic deployment,
(and) replaced many officers.
When Qin heard that Zhao Kuo was general,
they secretly enabled Bai Qi of Wu An to lead an army to attack Zhao.
He (Bai Qi) defeated Zhao Kuo in Changping,
shot Zhao Kuo,
(and) buried more than 400 000 Zhao soldiers alive,
in the battle of Changping the Zhao army lost more than 450 000 soldiers.
Lian Po lived a long life, he was 84 when he died!