Complex sentence: It lies off the southern tip of the Malay Peninsula and is north of the equator; it is also separated from Peninsular Malaysia by the Straits of Johor to the north, and from Indonesia's Riau Islands by the Singapore Strait to the south.
Split into simpler sentences: It lies off the southern tip of the Malay Peninsula and is north of the equator. Singapore is separated from Peninsular Malaysia by the Straits of Johor to the north, and from Indonesia's Riau Islands by the Singapore Strait to the south.