compound
sentence
是把两个没有从属关系的句子，用
and、but、so、yet
等连接词连起来。
complex
sentence
至少要有一个从句，标志的连接词有
although,
because,
since
等等，或者由关系代词
who,
which
等组成从句。
两者都有的称为
complex-compound
sentence.
since
they
have
numerous
classes
to
attend
and
extra-curricular
activities
to
take
part
in
明显是从句，所以你的例子是
complex
sentence。
虽然里面有
and，但是这个
and
是连接词组，不是连接并列句子。
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