Question: he had tried for years to persuade the university authorities to build a physics institute but, only after neumann retired was the physics institute built.
Answer: --> He had tried for years to persuade the university authorities to build a Physics Institute but, only after Neumann retired was the Physics Institute built.

Question: in the bay there is a dinghy with a powerful flashlight.
Answer: --> In the bay there is a dinghy with a powerful flashlight.

Question: the thick and heavy ice shield had also pressed the land’s surface down below the level of the sea.
Answer:
--> The thick and heavy ice shield had also pressed the land’s surface down below the level of the sea.