Why did Workers World and Socialism and Liberation split?

Why did Workers World and Socialism and Liberation split?
Does anyone know why Workers World and Socialism and Liberation split? I don't want to raise animosity, but I assume that there has to be some justification for the split.

Also the whole politics behind International Answer is very confusing.

I've worked with a variety of parties and I certainly see WWP as being the most action oriented. PSL seems similar although I've never worked with them in person. I'm really impressed by their website and technical skills. And the fact that they call everyone before any events seems to be a harbinger for their organization as a whole. Again I haven't had much contact with PSL but the little I've seen is very impressive. And they were only formed in 2003 yet they are already at the level of major Marxist parties such as CPUSA, RCP, WWP etc.

Besides political differences my main criticism of PSL would be that they do very little at least on their website to state what their theoretical beliefs are. The other parties are pretty up front. PSL has almost no theory on their webpage.

Neither of them emphasizes their Trotskyist origins, PSL has almost no mention of Trotsky although they continue to uphold Sam Marcy. PSL also praises Soviet industry from the 1930s without mentioning Stalin. They take a complex line on China. They go further than the CPUSA in saying that Deng was an open capitalist. At the same time PSL and WWP have launched the most vigorous defense of China. While China is very complex, it is quite a juggling act to call Deng a capitalist and defend China.

Theres a lot I like about both parties although I do have some major ideological differences. However as far as praxis is concerned WWP and PSL seem to be the most effective.

The Maoists call them Trots and the Trots call them Stalinist.

Those are my thoughts on both parties, and if anyone has any more info please let me know.