Ok kiddo, let me explain what reduced height of a field means. Imagine you're playing a game of soccer in a big field with a really high fence. Sometimes, if the players are very young or the field is really big, it can be hard to play the game because the ball might fly over the fence.
So, to make things easier and safer, sometimes we reduce the height of the fence by cutting it down or moving it closer to the ground. This means that the ball is less likely to go out of bounds or get lost, and it also makes it easier for players to see what's going on in the game.
Reducing the height of a field does the same thing. It means that the grass or turf is cut shorter so that it's easier to play sports like soccer, football, or baseball. This makes it easier for the players to run and move around without tripping on long grass, and it also helps the ball move more smoothly along the surface.
So, when we talk about reducing the height of a field, we mean making it shorter so that it's easier and safer to play sports. It's like cutting the fence down in your soccer game - it just makes things better for everyone!