Complex sentence: Some of these have been at the park for decades and form part of its heritage, the most obvious being the Scenic Railway, but also the Carousel (1954), and the Snails & Fairytails (1966).
Split into simpler sentences: Some of these have been at the park for decades and form part of its heritage, the most obvious being the Scenic Railway. But also the Carousel (1954), and the Snails & Fairytails (1966).