Chain of promises split apart and recombined

example.js

Promise.all(getSomePromises)
	.then(doSomeAction)
	.then(doSomeOtherAction)
	.then(function(data) {
		return Promise.all([
			Promise.all(data.filter(subsetOne).map(turnIntoPromises))
				.then(doActionOne)
				.then(doActionTwo),
			Promise.all(data.filter(subsetTwo).map(turnIntoPromises))
				.then(doActionThree)
				.then(doActionFour)
		])
	})
	.then(doSomethingWithCombined)
	.then(doFinalThing)
	.catch(handleTheErrors)

real.js

Promise.all([
	listAllFolderFiles(options.fileFolder).then(filePathsToStats(options.fileFolder)),
	mostRecentBackup(options.backupFolder).then(listAllFolderFiles).then(filePathsToStats(options.backupFolder))
])
.then(pickTheImportantFiles)
.then(continueOrThrowError(options))
.then(createDirectoryStructure(options.backupFolder))
.then(function copyOrSymlinkFiles(files) {
	return Promise.all([
		copyFiles(options, files.toCopy),
		symlinkFiles(options, files.toSymlink)
	])
})
.catch(function(err) {
	console.log('ERR',err)
	reject(err)
})