detain sb at His/Her Majesty's pleasure UK
to keep someone in prison for as long as the courts feel is necessary
I'd like to get what the structure is. There seem to exist two verbs in the as long as clause (feel, is)
anonymous for as long as the courts feel is necessary for as long (an amount of time) as the courts feel (that it) is necessary (to keep them in prison) ~ for as long as it is necessary (to keep them in prison) according to the courts CJ
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anonymousfor as long as the courts feel is necessary
for as long (an amount of time) as the courts feel (that it) is necessary (to keep them in prison)
~ for as long as it is necessary (to keep them in prison)
to keep someone in prison for as long as [the courts feel ___ is necessary].
“As long as” is a compound preposition so the whole underlined element is a preposition phrase that has a comparative meaning, comparing how long someone is kept in prison and how long the courts feel is necessary for that person to be kept in prison.
The clause “the courts feel is necessary” serves