original: Some trails are designated as nature trails, and are used by people learning about the natural world.
simplifications: Some trails are nature trails, used be people learning about nature. Some trails are nature trails. They are used by people learning about the natural world. Some trails are nature trails and used by people learning about the natural world. Some trails are designated as nature trails. They are used by people learning about the natural world. Some trails are for nature trails. They are used by people learning about the natural world. Some trails are nature trails and are used by people learning about the natural world. Some trails are noted as nature trails. These trails are used by people to learn about the natural world. Some trails are called nature trails and are used by people learning about the natural world. Some of the trails are nature trails to help people learn about the natural world. Most trails are designated as nature trails and used by people who learn about the natural world.