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Hyperinflation is generally caused by reckless goverments who let their money supply grow too fast
恶性通货膨胀一般是由不计后果地让其货币供应量增长过快的政府造成的

Words
Hyperinflation极度通货膨胀，超通货膨胀，恶性通货膨胀
Hyper-（more than usual,especially too much) 过分（的），过度（的）
reflation (the process of increasing the amount of money being used in a country in order to increase trade)通货再膨胀，通货复胀
Inflation(a continuing increase in prices,or the rate at which prices increase)
物价上涨（率），通货膨胀（率）

reckless
(not caring or worrying about the possible bad or dangerous results of your actions)轻率的，鲁莽的；不顾后果的

Sentence structure
A is caused by B
A is caused by B (who …)
A is caused by B (who let sth grow too fast)