Punctuation marks question

1

John lost five kilograms in August, however, he gained it back in September.

Shouldn’t there be a full stop after “August” and “however” be capitalised? Thanks.

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2

Could someone please help?

Thanks

3
  • John lost five kilograms in August; however, he gained it back in September.
  • John lost five kilograms in August. However, he gained it back in September.
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