Complex sentence: The beginning of 1990's saw a major renovation of the palace founded by the Regional Conservation Office and local authorities, however it was interrupted in 1995 when the legal heirs to the building began an effort to reclaim their ownership.
Split into simpler sentences: The beginning of the 1990s saw a major renovation of the palace founded by the Regional Conservation Office and local authorities. This renovation was interrupted in 1995 when the legal heirs to the building began an effort to reclaim their ownership.