Conversion of Simple sentences to Compound (Double) sentences

A Simple sentence can be converted into a Compound one by enlarging a word or a
phrase into a Co-ordinate clause.
Simple. -- He must work very hard to make up for the lost time.
Compound. -- He must work very hard and make up for the lost time.
Simple. -- To his eternal disgrace, he betrayed his country.
Compound. -- He betrayed his country, and this was to his eternal disgrace.
Simple. -- Besides robbing the poor child, he also murdered her.
Compound. -- He not only robbed the poor child but also murdered her.
Simple. -- He must work very hard to win the first prize.
Compound. -- He must work very hard, or he will not win the first prize.
Simple. -- He must not attempt to escape, on pain of death.
Compound. -- He must not attempt to escape, or he will be put to death.
Simple. -- Notwithstanding his hard work, he did not succeed.
Compound. -- He worked hard, yet did not succeed.
Simple. -- Owing lo ill-luck, he met with a bad accident on the eve of his examination.
Compound. -- He was unlucky and therefore met with a bad accident on the eve of his
examination.
Simple. -- The teacher punished the boy for disobedience.
Compound. -- The boy was disobedient, and so the teacher punished him.