* Si: If
* vous: you
* lisez: read
* ceci: this
* comme: like
* cela: that
Putting it together, the phrase means "If you read this like that."
However, the meaning is ambiguous because it depends heavily on the context. "This" and "that" could refer to:
* Specific objects: "If you read this book like that poem."
* Ways of reading: "If you read this slowly like that, you'll understand it better."
* An action: "If you read this sentence like that, you'll sound like a robot."
To understand the intended meaning, you'd need more context from the surrounding sentence or conversation.