Complex sentence: Today it is an important convention centre and tourist resort, offering a wide range of sport activities (golf, fishing, horseback-riding) and is a starting point for mountain treks and hikes especially within the nearby Triglav National Park.
Split into simpler sentences: Today it is an important convention centre and tourist resort, offering a wide range of sports activities (golf, fishing, and horseback-riding). It is a starting point for mountain treks and hikes, especially within nearby Triglav National Park.