The phrase "although there are difficulties" is correct and usable in written English.
It can be used to introduce a contrast or concession in a statement, acknowledging challenges while suggesting that something else is still true or possible.
Example: "Although there are difficulties in the project, we remain optimistic about its success."
Alternatives: "even though there are challenges" or "despite the obstacles".
Traditional methods require one to turn to paleontology and embryology, and although there are difficulties with these approaches, - because of the incomplete record can one be sure that one can truly say that something is derived?
The African lion plan started in 1993, focusing especially on the South African subspecies, although there are difficulties in assessing the genetic diversity of captive lions, since most individuals are of unknown origin, making maintenance of genetic diversity a problem.
This model has generally been successful in modeling the behavior of many observed afterglows at late times (generally, hours to days after the explosion), although there are difficulties explaining all features of the afterglow very shortly after the gamma-ray burst has occurred.
Although there are difficulties in inferring phylogenetic relationships between the lineages, the following four lineages can currently be clearly recognized according to S-segment-based phylogenetic analysis: DOBV-Af, DOBV-Aa, DOBV-Ap, and SAAV (see Fig. 1A, 2).
Although there are difficulties associated with comparing transfer coefficients developed using different surface sampling techniques, results of this work suggest that the default assumption used by the U.S. EPA OPP is reasonable.
Until now, neurotrophin-based treatments have progressed as far as preclinical trials; although there are difficulties with such clinical trials, phytochemicals from natural sources, as well as synthetic derivatives, have been shown to have potential as a means of controlling neurotrophin levels.
Although there were difficulties in experimentally evaluating some of the transport parameters, the results show that one of the expanded ignition criteria in particular does satisfactorily model the data.
Although there were difficulties signing Bryant to play in October to due scheduling conflicts, Virtus made an offer worth over $3 million for Bryant to play in 10 games starting in November.
Although there were difficulties associated with obtaining sufficient numbers of CSI metastatic samples, the similarities between tumors of different clinical stages were considered.
Although there were difficulties at the subspecies level, identification by MALDI-TOF MS was always correct at the species level when the broad cluster variation observed in the present study was considered.
