编辑一篇有语法错误的句子，并解释为什么这个错误会影响句子的意思。
   
My sister, who is an engineer, and travels frequently, bought me a new laptop and she said it was very useful for my work.
Corrected sentence: My sister, who is an engineer and travels frequently, bought me a new laptop. She said it would be very useful for my work.

Explanation: The original sentence contained a comma splice error, as two independent clauses ("My sister...frequently" and "she said it was very useful") were joined together with a comma instead of a conjunction or a period. This made the sentence confusing and awkward to read. The corrected sentence separates the two clauses into two distinct sentences, making it clearer and more concise.