1. They believe that the thieves got in through the kitchen window.

⇒ C1: It is said that the thieves got in through the kitchen window.

C2: The thieves is said that to be get in through the kitchen window.

2. She reported that the frost killed the flowers.

⇒ C1: It was reported that the flowers were killed by frost.

C2: The flowers were reported to have been killed by frost.

3. He told me that his football team had played well last season.

⇒ C1: It was told me that his football team had played well last season.

C2: His football team was told to have played well last season.

4. They said that many people are homeless after the tsunami.

⇒ C1: They say that many people are homeless after the tsunami

C2: Many people are said to be homeless after the tsunami. 

5. They thought that the prisoner escaped by climbing over the wall.

⇒ C1: The prisoner was thought to have escaped by climbing over the wall.

C2: It is thought that the prisoner escaped climbing over the wall.