David has been very lucky because his hobby has brought him enjoyment and success,|but he is also interested in many other things.
这是个并列句,but前后各一部分.在第一个句子主语是David ,has been very lucky 是谓语部分,because his hobby has brought him enjoyment and success,是原因状语从句,修饰谓语.
第二个句子,he是主语,其余是谓语部分.
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