Change the sentences using complex subject.
1. they say a german satellite enters earth atmosphere the following weekend.
2. they report that the escaped prisoner robbed the bank.
3. the meteorologists expect that this summer will be hotter in russia than usual.
4. it was reported yesterday that a teenager saved his little sister from the fire.
5. it is known that hurricane irene will reach new york and bring a lot of rain.
6. they say lady gaga is going to appear in the simpsons.
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1. It is said that a German satellite enters the Earth's atmosphere the following weekend.
Explanation: The impersonal "it" is used as the complex subject to introduce the reported statement.

2. It is reported that the escaped prisoner robbed the bank.
Explanation: The impersonal "it" is used as the complex subject to introduce the reported statement.

3. It is expected by the meteorologists that this summer will be hotter in Russia than usual.
Explanation: The impersonal "it" is used as the complex subject to introduce the reported expectation of the meteorologists.

4. It was reported yesterday that a teenager saved his little sister from the fire.
Explanation: The impersonal "it" is used as the complex subject to introduce the reported statement.

5. It is known that Hurricane Irene will reach New York and bring a lot of rain.
Explanation: The impersonal "it" is used as the complex subject to introduce the known fact about Hurricane Irene.

6. It is said that Lady Gaga is going to appear in The Simpsons.
Explanation: The impersonal "it" is used as the complex subject to introduce the reported statement.

Complex subjects are used when the agent or doer of the action is not specified or when the focus is on the action or event itself rather than the doer. In these sentences, the impersonal pronoun "it" is used as the complex subject to introduce the reported statements or expectations. This helps to make the sentences more objective and allows for a clearer presentation of the information.