[Grammar] Mark and Carl were at the second floor of the warehouse hidden behind old boxes.

[Nikitus]

Hello.

Are the following sentences grammatically correct?

"Mark and Carl were at the second floor of the warehouse hidden behind old boxes. Mark was filming Kevin that was under the effects of drugs after him drank some coffee, given by Mark that he did not know that had cannabis sativa. Carl was standing close to Mark and was worried about the quality of the recording."


Thanks.

 

[teechar]

Mark and Carl were [STRIKE]at[/STRIKE] on the second floor of the warehouse, hidden behind old boxes. Mark was filming Kevin who [STRIKE]that[/STRIKE] was [STRIKE]under the effects of[/STRIKE] high on drugs after [STRIKE]him drank[/STRIKE] drinking some coffee [STRIKE]given by[/STRIKE] that Mark [STRIKE]that he did not know that[/STRIKE] had spiked with cannabis (sativa). Carl was standing close to Mark and was worried about the quality of the recording.

.

 

[Tdol]

How about hiding?