Complex sentence: In the letter, MobiTV's legal counsel also suggested that they had been contacting HowardForums' site host and registrar regarding the matter, and that they would pursue legal actions if Chui did not comply.
Split into simpler sentences: In the letter, MobiTV's legal counsel also suggested that they have been contacting HowardForums' site host and registrar regarding this matter. They would pursue legal actions if Chui did not comply.