当初他红极一时。译英

Initially he was riding high.

at that time he was on his vogue

vogue 本身即是红极一时的意思。表示时尚，潮流，风行

当初:at that time
红极一时:be well-known for a time; enjoy popularity for a time
well-known for a time

He was quite a sensation then.
美国人通用表达法

Initially he was riding high