Complex sentence: Temasek, or'Sea Town' was the name used until the island was re-named'Singapura' ('Lion City' in Sanskrit) around the start of the 15th century.
Split into simpler sentences: Temasek, or'Sea Town', was the original name of the city now called Singapore. This name was used until the island was re-named'Singapura' ('Lion City' in Sanskrit) around the start of the 15th century.