William Strunk, Jr.

“ But a writer may err by making his sentences too uniformly compact and periodic, and an occasional loose sentence prevents the style from becoming too formal and gives the reader a certain relief. Consequently, loose sentences of the type first quoted are common in easy, unstudied writing. ”

“ It is of course equally correct to write the above as two sentences each, replacing the semicolons by periods.
If a conjunction is inserted, the proper mark is a comma (Rule 4) .
Note that if the second clause is preceded by an adverb, such as accordingly, besides, so, then, therefore, or thus, and not by a conjunction, the semicolon is still required.
In general, however, it is best, in writing, to avoid using so in this manner; there is danger that the writer who uses it at all may use it too often. ”

“ If there is room at the end of a line for one or more syllables of a word, but not for the whole word, divide the word, unless this involves cutting off only a single letter, or cutting off only two letters of a long word. No hard and fast rule for all words can be laid down. ”