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There is a workaround to avoid having your placemarks/lines broken up into multiple pages if you have a lot of them. This workaround also gets around long tracks being broken up into multiple lines. You can display a KML file using Google Maps by entering the http address of the KML file in the search box of Google Maps. When a KML file is displayed this way there is apparently no limit on the number of items that can be displayed (or at least the limit is higher). Also, when you display a KML on Google Maps using this method your long tracks/lines will not be broken up into separate lines.
If you don't want to upload a KML file to a web server to display it you can also display all the items of a Google "My Maps" map that has too many items to fit on one page using this trick. Just right click on the View in Google Earth link in My Maps to get the http address of the KML file, and then enter that in the search field in regular Google Maps. I have seen forum postings that some people have had problems with this, so posting a KML file to a web server may be the most reliable approach.
I decided to go with uploading my KML file to a web server and then searching for its URL in Google Maps. Once I that I faced the choice of whether to continue to use Google My Maps to edit my KML and then export the KML file, or to use Google Earth to edit the KML. Although both Google Earth and Google My Maps are awkward to work with if you have a lot items, I decided to go with Google Earth.
The problem with using Google Maps to render a KML file is that you don't get distance measurements on the length of lines. I decided to work around that by uploading my KML to Google My Maps and then clicking on tracks/lines there to find out the distance. There is also this hand web site that will tell you the length of a Google Earth track/line:
http://www.emaltd.net/google/gec/utilities/index.asp?l=en
