Re:Your comment

Hello Fionntán. The general idea of your translation is correct, but there are two cause-result structure which you may missed.

For God 便->如此so loved the world ->就that He gave 他的His one and 唯独only Son->使得that 任何人whoever 相信believes in Him shall not 死亡perish but have 永恒的eternal 生命life

And the official Catholic chinese translation is: