TASK DEFINITION: In this task, you are given a sentence in English and your task is to translate it into Spanish. In translation, keep the numbers and capitalization (capitalize only the first word of each sentence and name).
PROBLEM: However, there must be an appropriate level of supervision on the political side.

SOLUTION: Pero desde el lado político hay que restablecer el control adecuadamente.

PROBLEM: It is clear that, for once, the United States has not been able to secure progress on the restarting of these negotiations, and it is true that the obstacles are difficult to overcome: the Syrians wish to regain sovereignty and jurisdiction over the Golan Heights and re-establish the borders which existed before 4 June 1967, while the Israelis wish, since they consider that it suits their situation better, to have the borders which were set in 1923.

SOLUTION: Está claro que, por una vez, los Estados Unidos no han conseguido desbloquear la reanudación de estas negociaciones, y la verdad es que los obstáculos son difíciles: los sirios pretenden tener nuevamente bajo su soberanía y jurisdicción los Altos del Golán y recuperar las fronteras anteriores al 4 de junio de 1967, mientras que los israelíes pretenden, por considerar que se aviene mejor a su situación, tener las fronteras fijadas en el año 1923.

PROBLEM: The renovation project, which lasted for months, cut off this important route between the north and south of Europe.

SOLUTION:
Este reacondicionamiento, que duró varios meses, cortó esta importante vía de transporte entre el norte y el sur de Europa.