My advice is not to use "and" as the first word in a sentence, unless you are planning to use the comma + and structure to connect that sentence to the prior one.
Example:
original
I'm quite angry about what Alexander has done. And I will be angry for a long time, too.
Fix #1
I'm quite angry about what Alexander has done. I will be angry for a long time, too.
Fix #2
I'm quite angry about what Alexander has done, and I will be angry for a long time, too.
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