When you say it prints on two pages, are you saying that there are so many events on the calendar that only the first four weeks fit on the first page and thus the last week has to bump to a new page? If so, you might consider a general rule of shortening event titles, or you might consider if some of the calendars are not essential and deselecting a calendar or two before printing so that there will be fewer events on the page.
Or is there some other issue? If so, please help us understand what appears on each of the two pages that are printed for January. It also might be helpful for you to print additional months, and see if they all split onto multiple pages, or if there is something unusual with the month of January.
Questions that can benefit the larger community should be asked in a public forum, not a private message.