Large machine like clocks which tell the time was invented.
*If I want "which" refer to "large machine", will I need to add "comma" before "which" ?*
You can write it like the following sentences. Large machine-like clocks which could tell the time were invented. Large mechanical clocks, which accurately told the time, were invented.
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You can write it like the following sentences.
Large machine-like clocks which could tell the time were invented.
Large mechanical clocks, which accurately told the time, were invented.
A large machine, a clock which told the time, was invented.