[Grammar] Kevin got totally dirty on the stage

[Nikitus]

Hello.

Are the following sentences grammatically correct?

"Kevin got totally dirty on the stage after Cheryl dumped fish-head, yogurt and other things on Kevin`s head. Kelly, who would act as the romantic interest of Kevin in the play, began to laugh nervously and left the stage talking to Trish and Brittany. Kevin observed that the whole school laughed at him. He left the stage and the theater very upset.

After a while that Kevin walking away of the theater, he threw the special stone, which he found near his home, against a wall. A hobo approached to him and tried to spoke to him."

Thanks.

 

[Tarheel]

Try:

Kevin got totally dirty on the stage after Cheryl dumped fish heads, yogurt, and other things his head. Kelly, who would act as the romantic interest of Kevin in the play, laughed nervously....

 

[Tarheel]

Say:

After a while, Kevin walked away from the theater. He threw the special stone, which he had found near his home, against a wall. A hobo approached him and tried to speak to him.