I've thought about that recently.

In Germany, the 2 historically biggest parties were SPD (used to be liberal-democrat) and CDU (conservative) and they often were the ones tugging it out while the smaller parties were filling in as coalition partners for one or the other.

Over time, the SPD splintered into several semi-big offshoot parties (Linke, for example) while the CDU stayed as a whole. As a result, CDU is now commonly a favorite for getting most votes in an election.

Is that consistent with politics across the globe? And if, why do liberal or center parties tend to split up more than conservatives?