No, Look! A fish is at the end of the line. When we entered the zoo, we saw no beautiful animals at the end. He’s been learning English for two years. * The last two sentences doesn't have a complete thought and seems so complicated. It makes me hard to understand it

Yes , except for punctuation adding commas Look! ,A fish is on the end of a line. When we entered the zoo, we saw no end of beautiful animals. He’s been learning English for two years on end.