Have you ever dreamed of playing in front of thousands of people at concert.
Everyone is clapping and appreciating your music at concert.
拿此例说吧
1定语从句可以拆分成两个句子.先找到关系代词所代词的先行词,这里which代替的是concert.
2将关系代词which变回先行词 concert,并且放到合适位置,at which是介词短语 放句子后面即可
3前半句表达完整,直接把逗号变成句号即可
4把 at concert放在第二句句尾即可.
如果不明白可继续追问