Looks like some translation errors to me. Here is what I think some of the more confusing sentences mean:
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The electric motors are dual-purpose motors. They can be used either as motors or as generators as required.
If it is required, for example, to run on only the starboard diesel [while turning both screws], the starboard Diesel is started from the batteries [initially].
The [ignition] circuit is then closed and the Diesel will run under its own power.
The [starboard] motor is then switched to [generator mode] and the speed of the Diesel increased so that the starboard generator produces enough electricity to drive the port motor.
The electricity produced [by the starboard motor in generator mode] is led through the batteries to prevent the current fluctuating [like it would if the starboard generator output was connected directly to the port motor].
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The last part describes a table which documents the loss of power when running in this configuration, like you suggested with a loss of "Johnnies". :P
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