The long sentences can be expressed as another way, If you book the same seat too early will cost more than someone who does it later. It will also cost more if you book it too late. Any earlier = 太早 book = 訂 coach seat = 經濟座位 departure = 出發/離開(時間) hundreds of dollars more = 貴過

其实你可以断开句子看，例如：Any earlier, you may end up paying hundreds of dollars more / for the same coach seat / as someone / who books later. Waiting until too close to departure can be costly, too 断开后联系下前文即可。。。 一起努力吧！