Corrected Sentence:
One of the parties, John Doe, entered my land, and that's how the accident happened.
Explanation:
* "One of parties" is grammatically incorrect. You need to say "one of the parties."
* "John Doe entered my land and how accident happened?" is a run-on sentence. You need to break it into two separate sentences.
* "That's how the accident happened" is a clearer and more grammatically correct way to express the relationship between John Doe entering your land and the accident.
Other options:
* "John Doe, one of the parties, entered my land, and that's how the accident happened." This emphasizes John Doe's involvement.
* "One of the parties, John Doe, entered my land. That's how the accident happened." This emphasizes the separate events of John Doe entering your land and the accident happening.
It's important to choose the sentence structure that best fits the context and the information you want to convey.