Complex sentence: The original plan also specified that Ugata Station would be the terminus, however just before construction began, a request was made to members of an already-established railway company, Tokyu Corporation, to see if the plan drawn up by Shima Electric Railway was sound.
Split into simpler sentences: The original plan also specified that Ugata Station would be the terminus. However, shortly before construction began, a request was made to members of an already-established railway company, Tokyu Corporation, to see if the plan drawn up by Shima Electric Railway was sound.