1983 2.2 hilux diesel engine-- altenator in restored toyoace camper

One pipe is the vacuum hose from the brake booster which goes to the vacuum pump on the back of the alternator.
It has to be lubricated, so it will usually have an oil supply(small oil hose), to seal the vac pump as it works and the air the vac pump drags in will exit through a hose which attaches to the sump ie air and oil drain dumped into sump. Perfectly normal setup.