I think the best translation to add at the beginning of the third sentence would be In Addition.
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It's only the third sentence. You don't want to ramble on, but you also don't want to cut it short. State your main point, then add some side details. A good transition to another statement would be "In Addition" to this or that, etc.
With a 3d answer, much like a 3d shape there is definition within the answer. What a 2d shape its just flat meaning the answer has no detail and is very plain.