A newly developed jumbo rocket, which is expected to
carry the United States into its next phase of space exploration,
will be able to deliver a heavier load of instruments into orbit than the space shuttle can, and at a lower cost.
Question: In my opinion, the sentence may be not wrong , but at the same time 【, and】 is unnecessary,
even the sentence is better and more concise if 【, and】 is cut.
Is my opinion right?
Sincere thanks to dear teachers!