Complex sentence: The ongoing situation in the telecommunications market (2003)-monopoly on fixed and competition in the mobile lines business,-has led to overwhelming use of cellular phones for private customers, fixed lines being requested mostly by companies.
Split into simpler sentences: The ongoing situation in the telecommunications market (2003) is that there is a monopoly on fixed and competition in the mobile lines business. This has led to overwhelming use of cellular phones for private customers, fixed lines being requested mostly by companies.