Do not use the word however to connect two separate sentences—this is not possible. For example, the following sentence is incorrect:
Leather shoes are expensive however they will last a long time if we take care of them properly.
There are two possible corrections:
Leather shoes are expensive. However, they will last a long time if we take care of them properly.
Leather shoes are expensive; however, they will last a long time if we take care of them properly.
Notice that we use however as a transitional phrase at or near the beginning of a sentence. We also use it after a semicolon (;) to introduce a contrasting idea.
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