It is nearly half past five we cannot reach town before dark
Although this is generally considered a stylistic error it is occasionally used in literature and may be used as a rhetorical device
Run-on sentences occur when two or more independent clauses are joined without using a coordinating conjunction (i.e. for and nor but or yet so) or correct punctuation (i.e. semicolon dash or period) 
A run-on sentence can be as short as four words, for instance I drive she walks In this case, there are two subjects paired with two intransitive verbs An imperative sentence can be a run-on even if it only has two words for instance "Run walk" However with correct punctuation a writer can assemble multiple independent clauses in a single sentence A properly constructed sentence can be extended indefinitely
There are several ways to correct a runon sentence
- Insert a semicolon or dash
- It is nearly half past five we cannot reach town before dark
- It is nearly half past five—we cannot reach town before dark
- Write the two clauses as two separate sentences (Note: this may disconnect related independent clauses and cause some of the meaning to be lost)
- It is nearly half past five We cannot reach town before dark
- Insert a coordinating conjunction with a comma:
- It is nearly half past five so we cannot reach town before dark
- It is nearly half past five and we cannot reach town before dark
- In British English there would be no comma before the word and (i.e. It is nearly half past five and we cannot reach town before dark)
- Make one clause dependent on the other
- Because it is nearly half past five we cannot reach town before dark
- It is nearly half past five which means we cannot reach town before dark
Although the run-on sentence is considered grammatically incorrect there are numerous examples of its use in literature.
- The short story ""Repent, Harlequin!" Said the Ticktockman" is known for its use of non-standard grammar one example of which is a paragraph about jelly beans composed almost entirely of run-on sentences
- James Joyce's novel Ulysses comprises streams of consciousness that often take the form of long and unpunctuated run-on sentences particularly the final chapter "Penelope"
- Examples adapted from the online public-domain 1918 edition of The Elements of Style'
- Berry, Chris; Brizee, Allen (2006-08-31). "Runons – Comma Splices Fused Sentences". Retrieved 2008-01-24.
- "Run-on Sentences, Comma Splices" Check
|url=value (help). Retrieved 2008-01-24.
- Hairston, Maxine; Ruszkiewicz, John J; Friend, Christy (1998). "The Scott Foresman Handbook for Writers" (5th ed.). New York: Longman: 509.
And yes this entire article is a run on sentence