Sure, here are two constructed languages that were both designed to be easy to learn and use for speakers of multiple languages:

1. Interlingua: Interlingua was created in the 1950s as a simplified language based on the common roots of European languages, particularly Romance languages like French, Spanish, and Italian. The goal was to create a language that would be easy to learn for speakers of these languages, as well as speakers of English, since many English words also have Latin roots. Interlingua uses a relatively small vocabulary of around 8,000 words, and its grammar is simple and regular, with few exceptions or irregularities.

2. Toki Pona: Toki Pona is a language created in 2001 by Canadian linguist and translator Sonja Elen Kisa. It is designed to be a minimalistic language with a small vocabulary of around 120 words, making it easy to learn and use. Toki Pona's grammar is also simple, with no verb tenses, no plural forms, and no grammatical gender. The language is meant to encourage simplicity and mindfulness in its speakers, and its name means "good language" or "simple language" in Toki Pona.

While both Interlingua and Toki Pona were designed to be easy to learn and use, they take different approaches to achieving this goal. Interlingua is based on the common roots of European languages, while Toki Pona is a minimalist language that encourages simplicity and mindfulness. Both languages have their own unique communities of speakers and enthusiasts.
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