When the second independentclause in a sentence has an independent marker word, a semicolon is needed before the independent marker word.
当第二个单句出现时，需要有一个连接副词来引导，并在此连接副词前面加上一个分号。
2
An independentclause is a group of words that contains a subject and verb and expresses a complete thought. An independentclause is a sentence.
单句由主语和谓语构成，并表达一个完整的意思。一个单句即为一个句子。
3
Yes, a complex sentence by definition includes a main clause (independentclause) and at least one or more dependent (subordinate) clauses. Thank you for your question!