这些星体,比几个太阳的质量还要大,通常发展的比太阳一样的星体更快.
of more than a few solar masses是these stars的定语.句子主干为：
These stars evolve more rapidly than does a star like the sun.我不是很明白那个of more than 能再解释一下么？more than是修饰a few solar masses的，a few是修饰solar masses的more than意思是多于。of是of more than a few solar masses这个定语的特征词，more than a few solar masses是具体修饰的。不存在of more than这样的词组。